Malicious PDF — malware analysis report

Static analysis result for SHA-256 816caba3677a7adf…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 06:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b53b5ca3dfbddc55f73ab655e59d024 SHA-1: 7acfcb1d853f3e99aabfb8d67fc5664b22573574 SHA-256: 816caba3677a7adf0fd6193a5be0f4e6400bed8c9ba50a3430cae7a1c5348191
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=alveolitis+alergica+extrinseca+pdf+2020'. The document body and embedded artifacts suggest it is designed to appear as academic content, likely to deceive users into clicking the malicious links. The presence of numerous PDF links and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful sites.

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=alveolitis+alergica+extrinseca+pdf+2020
    • http://files.l2progamers.com/uploads/1/3/2/6/132695636/98376608.pdf
    • http://files.ywamchicoshop.com/uploads/1/3/1/0/131069869/tevonajoxalo_gugejomarawafu_kazanezazeruju_jobapotigak.pdf
    • http://vaxus.nfordtransitsystem.com/uploads/1/3/1/8/131871390/c370104e79fd.pdf
    • http://files.cfomtg.com/uploads/1/3/0/7/130776015/160b75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/conceit_in_metaphysical_poetry.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lokilus.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/49891577380.pdf
    • https://cdn.shopify.com/s/files/1/0436/8039/9513/files/nonanorexe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/15760275726.pdf
    • https://cdn.shopify.com/s/files/1/0439/6980/6494/files/biophilic_interior_design.pdf
    • https://cdn.shopify.com/s/files/1/0436/5064/6169/files/good_charlotte_good_morning_revival.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/83504771482.pdf
    • https://cdn.shopify.com/s/files/1/0431/8560/2721/files/bekuxekagasogimafadur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9187/0375/files/fundamentos_psicologicos_del_curriculo.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_off000069cd.bin
81aad32ba2f54333adcd319837bd2ccd3f11ee31a8e413be5c30cafcd9d25477		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CD 5712 bytes
font_01_sfnt_off00007d5b.bin
7f703704bf55e336a6733aa2fe34b54bbf30df214a00cc4bb03b34080ae8871e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5B 10312 bytes

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