Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5e7e8db097b0db…

MALICIOUS

PDF

54.2 KB Created: 2020-08-29 17:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95d75c150ab2d93f194c0ff866b58858 SHA-1: 27c7b67647732b03e6cafd71f51828ac2ce4bdc1 SHA-256: 6a5e7e8db097b0dbae78dc485bf6eee1e3e8c20c6db7813eb771eae3dff7497d
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector, disguised as 'chapter 13 human genetics worksheet answers'. The presence of many external PDF links suggests a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the embedded URL points to a known malicious redirector, likely intended to lead the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.me/wix?keyword=chapter+13+human+genetics+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_68e07adc3cec48a5ac8e7386976720b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2a7b9e453ab42369fa6184c26b403f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4438127516d449db6303ab701351ec8.pdf
    • https://static.usrfiles.com/ugd/9219f8_40865e54c5fd45af948499ce561089e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a2a4ab32b8341d4a2172f6311bc9e59.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/beludegifatirebej.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/suramedo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/gofapolurobut.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/zoology_optional_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/rosokusi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1938/5504/files/83785003867.pdf
    • https://cdn.shopify.com/s/files/1/0438/3283/6256/files/zuvaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalajenoderemomepofelefa.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c4a4161bd2b4a8bb1fa1a11db201805.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f1eae603d064ba0bd774092930af06a.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc25a47a265146d5aba92136afab4e3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0cc46f18ff542b3bfe17710fee3003e.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000094ea.bin
0d18c767b1189c6723c96fd999b913472a6422aaa5e98f58a600656355bcc5cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94EA 5592 bytes
font_01_sfnt_off0000a7e9.bin
9488a67d33af04e249c6336d13c42d375e958a6735afd0a0813d8e206bb93eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E9 10360 bytes

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