Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bf2f0b93169158…

MALICIOUS

PDF

35.6 KB Created: 2020-08-21 19:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e54d637564ecc442ce9759e971af5fb0 SHA-1: 77f5290af82c8cc195a32adb98ccfeea0053fdb3 SHA-256: 02bf2f0b93169158dedb092e0772aff30b68833d9a205d3158640254b594291d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.ru/pify?keyword=little+star+standing+egg+piano+sheet
    • http://files.givegmc.com/uploads/1/3/1/3/131383486/miwedederobuwow_vazavu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/xivuvetonozagafeponogigo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0142/files/muvipilivakid.pdf
    • https://cdn.shopify.com/s/files/1/0433/1254/5950/files/zokixemedudopaleginuxokup.pdf
    • https://cdn.shopify.com/s/files/1/0429/4849/3475/files/27825322518.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/42724742627.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/how_to_use_chinese_abacus.pdf
    • https://cdn.shopify.com/s/files/1/0431/7488/7590/files/debate_writing_format.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004094.bin
e10e558ec2cf8febe04b5ede14b491d810415c2861d2cbf68979e1c870494564		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4094 3536 bytes
font_01_sfnt_off00004d47.bin
0b7c56637f27d9c823ba03c3eb7f805f1b125e98ad5975c45fe88e9cb0a3d69f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D47 5164 bytes
font_02_sfnt_off00005ec2.bin
86d657b9ae95b705b254664543a959c95c8c575c10b9e7f25bc234b26d2d11db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC2 11032 bytes

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