Malicious PDF — malware analysis report

Static analysis result for SHA-256 0943063b0d944498…

MALICIOUS

PDF

42.2 KB Created: 2020-08-13 22:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f32321dd52dffbe14e7260d664c07e60 SHA-1: 6df440261da0c1a8152a7a3b66c96093094b5574 SHA-256: 0943063b0d94449873d46ad97a15f30c6ec25969de372ab02fc233719ce36506
154 Risk Score

Malware Insights

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

The sample was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/pify?keyword=hypertension+treatment+guidelines+during+pregnancy. Additionally, it contains a large number of embedded PDF links, many of which point to Shopify domains, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or malicious redirection attack.

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=hypertension+treatment+guidelines+during+pregnancy
    • http://taxowudox.marozniashop.com/uploads/1/3/2/6/132681670/8859795.pdf
    • http://files.theback40museum.com/uploads/1/3/1/4/131438510/c717b321.pdf
    • http://pigeta.christchapelmaine.org/uploads/1/3/1/4/131407406/sowezomuzazovu.pdf
    • http://files.torontowolverines.ca/uploads/1/3/0/7/130775921/9687790.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/closers_survival_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1153/8072/files/bu_jhansi_exam_time_table_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69696378660.pdf
    • https://cdn.shopify.com/s/files/1/0433/0396/0731/files/squeeze_theorem_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/90878965197.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/21473797758.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/befuronaguxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/58316307712.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/atmega32_datasheet_download.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_off00006741.bin
03448e121000608b7d37d19d6740e3d00c7d45088fe9833359f8160566da0660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6741 5456 bytes
font_01_sfnt_off000079b9.bin
a9bc189734842f0aee25a226514ff2bdbaf73738d7285addf28fa8d39cbcc485		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B9 10064 bytes

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