Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a232578a43bfae7…

MALICIOUS

PDF

39.8 KB Created: 2020-08-19 09:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b38f4263c74ba9beff2e538f27de5359 SHA-1: 2ec7321dc8df165779a606c98d0c2056c9e82df2 SHA-256: 7a232578a43bfae70fd13408c28274f162b5f06ff9d8ed5d733d6b4c31760f5a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, includes the same malicious URL and appears to be a lure disguised as a 'project endorsement template'. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, likely to obscure the malicious intent.

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=project+endorsement+template
    • http://files.judhampson.com/uploads/1/3/1/8/131871642/lepiwapite-desexaduxosigo.pdf
    • http://files.cardenarborview.org/uploads/1/3/0/8/130874125/bulimegefotevo.pdf
    • http://ribes.berkshirephotographydesign.com/uploads/1/3/1/4/131437254/loxotafebolun-kujanojegowaso-letapok-xawab.pdf
    • http://files.amandahudsonart.com/uploads/1/3/1/4/131406430/setisu_pojufusojivala.pdf
    • http://jalelafab.hollyterrens.com/uploads/1/3/0/8/130874038/wodevemise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/98403829388.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/english_speaking_in_marathi_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/tri_fold_brochure_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/ruzexobigivowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/how_to_use_digital_multimeter_dt9205a.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/muxixuvujadozamedeseka.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/nijolixozawobavuf.pdf
    • https://cdn.shopify.com/s/files/1/0440/4363/2805/files/vocabulary_exercises_for_advanced_students.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/vagisudom.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/12686489641.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7991/files/conjunctions_exercises_intermediate.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_off00005f4e.bin
27b95f6ff60c52853a56c4b41c49fa532c7ccf40bc9a88ae41cffea7b7e12515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4E 5296 bytes
font_01_sfnt_off00007133.bin
0a8f4e7bda46af27a796c0e2f0c1f61cdf556964feac2064babaea191627bb9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7133 9660 bytes

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