Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfcd052abbb4b0e…

MALICIOUS

PDF

46.7 KB Created: 2020-08-30 16:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d92f42701d3b9ee926243d7b64e78368 SHA-1: a9c203ed10b53a95ab66475e49d02a285dd7ba57 SHA-256: 6bfcd052abbb4b0e52b3e92443f32cd0a2e02c87b7b03a9e9258ed225358af0b
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'big debt crises book review' and the malicious URL, suggesting a phishing or scam lure. The ML classifier also strongly indicated 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/wix?keyword=big+debt+crises+book+review
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_09334912cfe84fe58a2eb31cacd0fefb.pdf
    • https://static.usrfiles.com/ugd/4bb894_bfe28638c8cd437d89a8f9afb436ab4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c79c3b56b2d8456cb416a272aa5cb81e.pdf
    • https://static.usrfiles.com/ugd/7baf93_ee3d6c453a904a468ccc55fcf3303125.pdf
    • https://static.usrfiles.com/ugd/b8c837_d17a12ab3c924693bdab35d794cb1d11.pdf
    • https://static.usrfiles.com/ugd/43d598_01fae234e26a4339956c6b33e83ec8bf.pdf
    • https://static.usrfiles.com/ugd/1849a1_65f52dbb879841f6bf38e4a728fc0102.pdf
    • https://static.usrfiles.com/ugd/8ab72e_45467de1e1a94daab9748b316045f3a5.pdf
    • https://static.usrfiles.com/ugd/a107db_76738c2f6c2d490c8bf09c08fc83ce85.pdf
    • https://cdn.shopify.com/s/files/1/0431/8648/7455/files/gisuni.pdf
    • https://cdn.shopify.com/s/files/1/0438/1097/9997/files/49126635747.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/pagigimiwirupem.pdf
    • https://cdn.shopify.com/s/files/1/0457/3619/8300/files/rivawunerofiwoza.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0704/files/newitegizajutejatura.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1862/files/47852315632.pdf
    • https://cdn.shopify.com/s/files/1/0431/3805/6354/files/19033644259.pdf
    • https://cdn.shopify.com/s/files/1/0440/7567/9896/files/samsung_ml_2525w_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/9273/6155/files/son_10_yln_km_paragraf_sorular.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_off000078b9.bin
ef4eac974503c5845425c690c851e3ea989e62dae7241355e2d4ec4663bace43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B9 5268 bytes
font_01_sfnt_off00008ad0.bin
0dac2dc89919b77c0b7ec67ff16ecfa21d4da51bf0ea37ddac52579162dd0743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD0 10132 bytes

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