Malicious PDF — malware analysis report

Static analysis result for SHA-256 475639d0b34524c8…

MALICIOUS

PDF

77.5 KB Created: 2021-01-12 14:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 78584e6fa7d471b52c3bf1e750b1cca4 SHA-1: e59becf42cc7b79f4b5e91953ecd291d4cb23409 SHA-256: 475639d0b34524c8f7f4ecc49b7740f27085c870af7878034bdf5ac99e53a814
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains heuristics indicating it is a malicious redirector, specifically designed for phishing and SEO lure tactics. The embedded URL points to a redirector that, when followed, leads to a download link for a game, likely a pretext for delivering malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/aws?utm_term=injustice+gods+among+us+apk+uptodown In PDF document text
    • https://site-1173429.mozfiles.com/files/1173429/sagulazefefatovuzuwofibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5ffd237b7d122.pdfIn PDF document text
    • https://site-1084052.mozfiles.com/files/1084052/space_racing_3d_star_race_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5feafe8cb6d2f.pdfIn PDF document text
    • https://site-1196822.mozfiles.com/files/1196822/dragon_mod_for_minecraft_1__12__2.pdfIn PDF document text
    • https://site-1173293.mozfiles.com/files/1173293/kugavuwufetomukepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5f97d96051c0b.pdfIn PDF document text
    • https://site-1174819.mozfiles.com/files/1174819/71726308937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/chaos_tamil_dubbed_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/busizezin.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/user_manual_for_yoho_smart_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/refraction_and_dispersion_of_light_class_8_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/gidutobaf.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
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 5436 bytes
SHA-256: 669d5c538b99d8bab5cb5364f6d2a15573483c32f6a1fc49a67048631f189485
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10248 bytes
SHA-256: 19f94baabc0c3d8a8adfa7de8036b99dfa8b34df1221f9556160ca037c0a4cce
font_02_sfnt_off00011075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 17068 bytes
SHA-256: e26f8079aa65d88f7aba669dd2cdecbc7018a465c7ba2d7a6bc859a1db7beb3c

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