Malicious PDF — malware analysis report

Static analysis result for SHA-256 0508dff1c95841ca…

MALICIOUS

PDF

46.0 KB Created: 2020-08-09 06:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67cbbc14f5f050c411cfc7ec75709db4 SHA-1: 38d6b7968917bccaec968dd4485a165ace46e19b SHA-256: 0508dff1c95841ca8b478f0b16f9826b9595ff7462db2974ea9bb203abfa0429
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at `https://ttraff.ru/pify?keyword=planos+arquitectonicos+completos+pdf`. The document body, though heavily obfuscated, also contains this URL and other benign-looking Shopify URLs, suggesting a link farm or SEO poisoning tactic to lure users. The ML classifier strongly indicates maliciousness.

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/pify?keyword=planos+arquitectonicos+completos+pdf
    • http://files.aratiinternational.com/uploads/1/3/0/8/130874671/5738791.pdf
    • http://files.nhstudentwellness.org/uploads/1/3/1/8/131871633/90fcec093.pdf
    • http://files.hudsonvalleybookdesign.com/uploads/1/3/0/7/130740563/9112005.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/87744750388.pdf
    • https://cdn.shopify.com/s/files/1/0431/1757/6354/files/54846184504.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bovabokuvuxinapuwukiberem.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/vajifojav.pdf
    • https://cdn.shopify.com/s/files/1/0430/9558/9013/files/nuvuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7834/4097/files/gosamibusorogabivos.pdf
    • https://cdn.shopify.com/s/files/1/0436/9298/2427/files/31654889637.pdf
    • https://cdn.shopify.com/s/files/1/0448/4608/8349/files/try_catch_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gozoba.pdf
    • https://cdn.shopify.com/s/files/1/0441/2270/1976/files/11835688530.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4344/files/a_guerra_dos_tronos_a_muralha_de_gelo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0208/files/jajogikavupezojodajar.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_off00007175.bin
ec0cd63e902d2d13a66bc6b59724b18367d4824a09feace27535904bf063db4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7175 5428 bytes
font_01_sfnt_off000083cf.bin
e0ab116d17aabdcc71dc14b255d2d572cd5c002b7899897c2063a57f4059c203
pdf-font-stream PDF embedded font (sfnt) at offset 0x83CF 11568 bytes