Malicious PDF — malware analysis report

Static analysis result for SHA-256 831550651c3c4c4c…

MALICIOUS

PDF

130.1 KB Created: 2020-08-12 23:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38d371a0a56ded0e783958b7314544cf SHA-1: 0fe7524fe1265e3a606e40e52d7b8f333d2a2769 SHA-256: 831550651c3c4c4ccfff11eca3d25cb26ed193099c57406cb13a9d0f9eb5d081
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a search result for an engineering textbook. The ML classifier and heuristic firings strongly indicate malicious intent, likely to lead the user to a phishing or malware distribution site. No scripts were extracted, but the presence of numerous external links, including a malicious redirector, points to a content-luring attack pattern.

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=cambridge+english+for+engineering+solutions+pdf
    • http://melada.interviewsandreviews.com/uploads/1/3/1/3/131379246/3701411.pdf
    • http://files.sargent-thamm.com/uploads/1/3/0/9/130969633/6207205.pdf
    • http://files.wflta.com/uploads/1/3/2/7/132710676/1036563.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7749/2118/files/formacion_de_la_tierra_y_su_atmosfera.pdf
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/c._r._e_form_3_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/mebex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1187/4716/files/dajixuro.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5766/files/7539732370.pdf
    • https://cdn.shopify.com/s/files/1/0433/0553/3604/files/68306962717.pdf
    • https://cdn.shopify.com/s/files/1/0447/8432/0661/files/origin_and_development_of_sociology_and_anthropology.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/vbs_export_to_excel.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/dufamilij.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/liwulakor.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1468/files/biomedical_waste_management_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0448/2121/7442/files/alphabet_tracing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/mopigexenobumukemiwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/38915935244.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_off0001b5eb.bin
d2d27dd111d8743345224d3818ee79d61e9818ed7f688d0a1c83ca9722b517df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5EB 5500 bytes
font_01_sfnt_off0001c86c.bin
d15bafd194b420f0114018d3892f465f52bc619c743255f33ea40498e4cf06cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C86C 16260 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.