Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4bc85d8546e6fc…

MALICIOUS

PDF

98.6 KB Created: 2021-01-13 18:08:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb171fda7a309771e94a81a719a58b5b SHA-1: 27bbcd75eca05b831dedcbd7a3144b5b9891d6ff SHA-256: 4a4bc85d8546e6fcadbdcaf78f131003d433a7a7d8c6657adaf8019a91c3f145
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and links to known malicious redirector infrastructure, indicating an attempt to exploit vulnerabilities or deliver a payload. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the URL 'https://traffine.ru/aws?utm_term=parallel+lines+worksheet+1' as malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffine.ru/aws?utm_term=parallel+lines+worksheet+1 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5fde64e94cb5f.pdfIn PDF document text
    • https://site-1178385.mozfiles.com/files/1178385/uber_driver_salary_nyc_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/eje4euJ/avatar_maker_nice_pony_apk.pdfIn PDF document text
    • https://site-1174507.mozfiles.com/files/1174507/street_dancer_instrumental_ringtone_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5ff19b0960a47.pdfIn PDF document text
    • https://site-1172169.mozfiles.com/files/1172169/10714747281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5fada2bb36838.pdfIn PDF document text
    • https://site-1168441.mozfiles.com/files/1168441/sky_force_cowboy_space_3d_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/dexemewuvupo.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/51682062074.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/84047410279.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 6716 bytes
SHA-256: 19175807fc35d4dafb65bfeaa581a25bd20d5298d05b9d48fbdab29c9d2d4271
font_01_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 3436 bytes
SHA-256: 150347a6c28a41331eca5b056ddefd362a80534176fba5dc72dec9e7d60132c5
font_02_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 4772 bytes
SHA-256: 09dd46ad93ec753c6130de889b96ff7e82cbf01ba464e9d35f5c63011cf1055b
font_03_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 2180 bytes
SHA-256: 25a72a4a60f233d6106323e1a964fad1a35576d452af95369767f437c0572786
font_04_sfnt_off0001233c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233C 15368 bytes
SHA-256: 7e89fb1e732724fbf4a522d41a389d116b7e552da9fa66db1467364205810ebc
font_05_sfnt_off000155dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DC 16896 bytes
SHA-256: f441a440615f637c72e906081129f4dd63df188fb65000f9177d3dd81979d33e
font_06_sfnt_off00016e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E08 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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