Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6af09e5a2bb4d0…

MALICIOUS

PDF

61.4 KB Created: 2020-08-15 09:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 769886bbf98e4218a5b1d8b003302861 SHA-1: 01fa0bc751db18aa03c2952b8a1836f47219f8b9 SHA-256: 5d6af09e5a2bb4d084ab12b54933390db28492e81d8b69fb58e8504166a3952c
174 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure to download a manual, which is likely a pretext for delivering a malicious payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wb?keyword=hunter%20scissor%20lift%20manual
    • http://liluror.jenlarussa.com/uploads/1/3/0/7/130775953/kamip_xobokovowapoz_fegimotijira.pdf
    • http://files.dwarfhollowfarmstead.com/uploads/1/3/0/7/130775434/zonito-sojusaferasuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/global_affine_differential_geometry_of_hypersurfaces.pdf
    • https://cdn.shopify.com/s/files/1/0438/4548/4706/files/mowoxapenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/81381018351.pdf
    • https://cdn.shopify.com/s/files/1/0431/7151/2480/files/98480881174.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/calculus_for_scientists_and_engineers_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/after_effects_the_power_of_expression_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/88000143832.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/turning_process_in_lathe_machine.pdf
    • https://cdn.shopify.com/s/files/1/0428/9167/3763/files/isotopic_abundance_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3540/files/calvin_and_hobbes_comics.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0165/files/93903990265.pdf
    • https://cdn.shopify.com/s/files/1/0450/6117/7507/files/blackstone_real_estate_partners_viii.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_off0000a1a2.bin
0823cfa3b79ba8b66e849cf1701167af9d509364b0b48ed52f2ecd9c155641cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A2 4988 bytes
font_01_sfnt_off0000b275.bin
991cba25aaba56717acb24bc86e05652e0c5e9535da7545a9a401aaab8b6d873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB275 17736 bytes

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