Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c2f87a0a0438dd…

MALICIOUS

PDF

65.6 KB Created: 2020-08-10 21:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab42d8a00f822d302de0f85cece86342 SHA-1: 4ef8423dd30bb3c3debcaacc2c2bdda2af2293db SHA-256: 16c2f87a0a0438dd061b4b220124e66af2144dee01b979c93c1af7c90fbf8d9c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but also includes a critical link to a known malicious redirector at 'ttraff.ru'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'factors affecting absenteeism pdf' and the authoring application 'wkhtmltopdf', suggesting a lure for SEO spam or phishing. The presence of many external links indicates a link farm strategy.

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=factors+affecting+absenteeism+pdf
    • http://bebowu.geotargads.com/uploads/1/3/1/4/131406082/logigizoluwi-dazuxupe-fiborinenadaf.pdf
    • http://files.goheenpiano.com/uploads/1/3/0/7/130739658/d0b33f20ca88d6.pdf
    • http://files.milesofalaska.com/uploads/1/3/0/9/130968960/daxugamupufuzizovi.pdf
    • http://files.natalia-theodoridou.com/uploads/1/3/0/7/130776609/xobitokex-rapotawesasut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/14284874192.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8581/files/96406169173.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/29386032493.pdf
    • https://cdn.shopify.com/s/files/1/0431/5706/1781/files/66515519550.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/6465156165.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdf
    • https://cdn.shopify.com/s/files/1/0436/1748/4957/files/pedagogy_of_physical_science_notes.pdf
    • https://cdn.shopify.com/s/files/1/0439/3356/5096/files/mozijiwapido.pdf
    • https://cdn.shopify.com/s/files/1/0430/6337/8081/files/a_course_in_combinatorics.pdf
    • https://cdn.shopify.com/s/files/1/0438/9725/8136/files/48361877454.pdf
    • https://cdn.shopify.com/s/files/1/0431/0027/4845/files/jenagujigikowofora.pdf
    • https://cdn.shopify.com/s/files/1/0428/9141/1615/files/sample_css_file.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_off0000c2df.bin
3ae265d601a7962f81894fdf09cc72f1974bae48cdc9555b9a5cfb2598de95fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DF 5540 bytes
font_01_sfnt_off0000d593.bin
291fe64bb38e21acbd7602b438466ac9e3c67159f609131740eb67741be70b29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 10488 bytes

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