Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9b251657a03b96…

MALICIOUS

PDF

51.1 KB Created: 2020-10-07 15:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4d27b0bd7f11940336abb29e9373fe69 SHA-1: 3b108c0f3cefa4395222c65f965a8e9802224173 SHA-256: 4b9b251657a03b9650610b1bdda371bbceb21f7be6a176f2b5a55d6b76be63de
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. One of the embedded URLs, https://gettraff.ru/strik?keyword=java+how+to+program+early+objects+11, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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/strik?keyword=java+how+to+program+early+objects+11 In PDF document text
    • https://site-1039493.mozfiles.com/files/1039493/60358510635.pdfIn PDF document text
    • https://site-1036635.mozfiles.com/files/1036635/77445308936.pdfIn PDF document text
    • https://site-1039999.mozfiles.com/files/1039999/40476067705.pdfIn PDF document text
    • https://site-1036900.mozfiles.com/files/1036900/56238741957.pdfIn PDF document text
    • https://site-1036965.mozfiles.com/files/1036965/44705795907.pdfIn PDF document text
    • https://site-1042014.mozfiles.com/files/1042014/doxudurijuvoxirelazidu.pdfIn PDF document text
    • https://site-1038951.mozfiles.com/files/1038951/vifoverexa.pdfIn PDF document text
    • https://site-1039556.mozfiles.com/files/1039556/kepowupinixuxifozuneg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9df776-0158-4567-bd5b-be0a08b43fde/39990871222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516d72f5-8be0-4847-ac8b-264a4c6742a8/kikajiseloxamuxapuxamukuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a298b5bc-7e9f-443f-b730-63e5320a58a0/totobejitatorus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10afd9cf-b519-418b-8ec4-fed4ebeddc47/vopexuwoduvifuzopove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cb3a3a-39db-4b5f-8881-dea50212e713/38029761658.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/19372987413.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/future_fight_iso_set_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/5975/8492/files/hotspot_shield_elite_vpn_v5.8.6_cracked_apk_latest.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE5 5856 bytes
SHA-256: bd742af45bdb6268dd0ca972bdd5a8499f415acf2072f6e33986b6d1e124861a
font_01_sfnt_off000083d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D3 10208 bytes
SHA-256: 7570708dad4d24d36e0d667181cd6154c8793dcf1dc7417b7e1f686b9cbeb178
font_02_sfnt_off0000a6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6FE 16976 bytes
SHA-256: e259cfcf3d7fe8ba08d530765c92481648bb225a1838f64e589ed01a629c83ce

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