Malicious PDF — malware analysis report

Static analysis result for SHA-256 687fdccde01f79fb…

MALICIOUS

PDF

46.7 KB Created: 2020-07-30 10:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6cdda2073ff30b2941f960ea65d8776 SHA-1: 64ff10a501959bd70add0eb5748a0b55ebae34e2 SHA-256: 687fdccde01f79fb61b62feee524c97592628c156744090e3da32c86f88e1e2a
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/pify?keyword=argumentos+contra+a+pena+de+morte+pdf. It also exhibits characteristics of a link farm, embedding numerous external PDF links, many hosted on Shopify. The document body, though heavily obfuscated, suggests a lure related to 'Argumentos contra a pena de morte pdf'. The primary attack vector appears to be social engineering via a malicious link embedded within the PDF.

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.cc/pify?keyword=argumentos+contra+a+pena+de+morte+pdf
    • http://files.mrssheltonfacs.org/uploads/1/3/1/3/131380944/tuzegazebajavawejup.pdf
    • http://files.resourcefulindonesian.com/uploads/1/3/1/4/131437563/weziw-xerufase-makubafurogomo-tejizitaw.pdf
    • http://files.warmnightcandles.com/uploads/1/3/1/4/131454304/wixarefobu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/531254491.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/lowatotapo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9285/9293/files/lidepodafujej.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/42564103459.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/simem.pdf
    • https://cdn.shopify.com/s/files/1/0432/9131/2288/files/88631562089.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/murugokidarerileludi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jezimix.pdf
    • https://cdn.shopify.com/s/files/1/0439/2891/2040/files/repix.pdf
    • https://cdn.shopify.com/s/files/1/0437/8286/5047/files/25627541078.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/11040436203.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/tofuwet.pdf
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/81684438257.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_off0000752c.bin
1ddd4bf3af031c8d6e5e252d43b15b696994e94fd4d51b5926e26b3e2f07bae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752C 5264 bytes
font_01_sfnt_off000086f3.bin
774de12a4050830c0ae8be18565a2fcf06f8e8846771e3b409704bbeb5d6858e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F3 12252 bytes

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