Malicious PDF — malware analysis report

Static analysis result for SHA-256 6452dee476ada48b…

MALICIOUS

PDF

48.9 KB Created: 2020-08-30 02:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e296595e062058394e78b73119b9e16 SHA-1: 0a6f250c3b6e38a5e02e469ea03bd2c0e9c62a7e SHA-256: 6452dee476ada48babefea9d7997c81f9402debf116c11f7620824671d1ca9d2
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.ru/wix?keyword=how+to+add+subscripts+in+excel, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. The presence of numerous other links to PDF files on Shopify and static hosting sites, combined with the malicious redirector, indicates a link farm or SEO poisoning tactic to distribute malicious content.

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.ru/wix?keyword=how+to+add+subscripts+in+excel
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7566/6073/files/complete_beatles_chronicle.pdf
    • https://cdn.shopify.com/s/files/1/0434/0976/8604/files/i_need_you_love_pentatonix.pdf
    • https://cdn.shopify.com/s/files/1/0429/9823/5289/files/53035235607.pdf
    • https://cdn.shopify.com/s/files/1/0437/6467/8807/files/arkham_horror_lcg_rulebook.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/middle_school_reading_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/zirejatanero.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/how_to_memorize_bible_verses.pdf
    • https://static.usrfiles.com/ugd/dd4472_76d15ae0b894419f857d8c665ee2a1f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9dae4572c89c462bb1fbd486ac6bdc0a.pdf
    • https://static.usrfiles.com/ugd/217d68_d2e5cb0fbab1445eae653bbd2b956b70.pdf
    • https://static.usrfiles.com/ugd/d2751c_ac2b5eee17364374bafd19f5ffee4310.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/girisun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pejodogidevetakuranuwa.pdf
    • https://cdn.shopify.com/s/files/1/0440/1928/6174/files/anaemia_in_pregnancy_rcog.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ac.bin
36ae61aadf576b063e281a6286a64a4bf99e0ddb932b7ba6057c6cac8ab40145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AC 5328 bytes
font_01_sfnt_off000077df.bin
263b0325ab7758784fa7203adf5eb162af28e1f799232ed7fbb3f18a1af0da41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DF 10576 bytes
font_02_sfnt_off00009c45.bin
444e6400e6f683153d72008db01d504e004a03ffbd1526e7756841b352a6fa3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C45 18064 bytes

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