Malicious PDF — malware analysis report

Static analysis result for SHA-256 82056502c5540b51…

MALICIOUS

PDF

39.7 KB Created: 2020-08-19 12:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7535cb3c5cdc9349e9297bab4e6c4be2 SHA-1: 81cfadb600fb9bf4c0d979c5b462692dc7513ce5 SHA-256: 82056502c5540b51422234b7569c8d7d295b8e8025533f08881d266c48a46837
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=10+characteristics+of+management+information+system', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to potentially harmful content.

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=10+characteristics+of+management+information+system
    • http://files.healingsanctuaryexton.com/uploads/1/3/0/8/130874361/84016dfb8a.pdf
    • http://ditizul.thehocklocker.com/uploads/1/3/0/8/130813403/jabamax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1510/9794/files/77669035972.pdf
    • https://cdn.shopify.com/s/files/1/0436/2177/7570/files/759083210.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5055/files/bipaviloxuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/assessment_in_special_education_a_practical_approach.pdf
    • https://cdn.shopify.com/s/files/1/0437/3102/6071/files/risk_management_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6920/files/bhature_recipe_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0969/6156/files/corporation_bank_fd_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3399/files/cardinal_and_ordinal_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4105/files/36590884781.pdf
    • https://cdn.shopify.com/s/files/1/0434/4732/0728/files/37671955637.pdf
    • https://cdn.shopify.com/s/files/1/0438/1815/6192/files/carol_of_the_bells_easy_piano_sheet_music.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_off00006088.bin
d33afaf48b3ba9659d3285d7a1e880b851a66ffab6e5d0c232bb2856dd0a8cac
pdf-font-stream PDF embedded font (sfnt) at offset 0x6088 5464 bytes
font_01_sfnt_off00007301.bin
1bf3556f6e76aa519e4bb476a373ff1b7724f631ea93cbb42e969a6d75897088
pdf-font-stream PDF embedded font (sfnt) at offset 0x7301 9052 bytes