Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5156c8c1e701e4…

MALICIOUS

PDF

46.5 KB Created: 2020-08-31 10:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92aa8a7aeb77f7d95957ee3b222e5c25 SHA-1: ce30691fa2d1ce6710042b44f521c772124fe252 SHA-256: 0f5156c8c1e701e466cacb9f62edd1c61cee57a0338cfe0155afdeae8de5a1d8
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wix?keyword=atube+catcher+2018'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links. The presence of a 'download button' lure further supports a malicious intent to redirect users to harmful content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=atube+catcher+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/4b7290_4ede78f5615844aa93e2d77faceafc96.pdf
    • https://static.usrfiles.com/ugd/1be480_db8cdc3bb4b744bf88a45169830ddd29.pdf
    • https://static.usrfiles.com/ugd/02beb7_45afde356d3b4cedab204cc987c44037.pdf
    • https://static.usrfiles.com/ugd/0a052f_45d181c423e24c9895bc33aa31834d4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6bda7af1f449e880e4ca11bba2ed33.pdf
    • https://static.usrfiles.com/ugd/4ae4db_f7ae7aa86dd04e44be56a82f36a66eb9.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/open_office_souligne_tout_en_rouge.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/wabok.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/christian_theology_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/5056/4773/files/kuzolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/tasitukelasoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/organism_classification_coloring_page_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/cecil_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0441/2696/1816/files/12199067333.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_off00006090.bin
9171d836b5523f6dcf1a2c2f84bfbed11ebc0cfc9d322937213c87d454e3349d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6090 5324 bytes
font_01_sfnt_off000072a6.bin
74784d43bc24555ad1e7803ec4e5188564f53524068d61063c44d5446904316e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A6 10504 bytes
font_02_sfnt_off0000966d.bin
ceed4f46af388504ba7f7c47bef0ccba38f515243cc1a0ddefbbb31a18811c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x966D 16612 bytes

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