Malicious PDF — malware analysis report

Static analysis result for SHA-256 825de1b149206a88…

MALICIOUS

PDF

41.9 KB Created: 2020-08-09 22:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abfcd1f9300594856d0d0f88748a5b22 SHA-1: 47b10e7a4db667eb922ebb28ebdca78a37b11e74 SHA-256: 825de1b149206a88420a638a3f63d68732c8f869db792cf9d4c43bd2c034962c
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a large number of embedded links, many pointing to external PDF files, suggesting a link farm or distribution mechanism. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the presence of numerous external links indicates a potential for distributing further malicious content or engaging in SEO manipulation.

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.com/pify?keyword=short+functional+text+advertisement+pdf
    • http://files.quizking.net/uploads/1/3/1/1/131164573/fewuk.pdf
    • http://files.dominicanhairalliance.com/uploads/1/3/0/9/130969545/pobax_fatavutizaj.pdf
    • http://files.mountainmanperformance.com/uploads/1/3/0/7/130740323/2497085.pdf
    • http://files.gopherstatefire.com/uploads/1/3/2/6/132695513/c7af8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/didusowegoruvufunewono.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7991/files/22604681736.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/tubemetokafanokaredururil.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/netosowupibupolimuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/81783182631.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/78434753854.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8936/files/minecraft_default_improved.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/seponajogapoxisejesusag.pdf
    • https://cdn.shopify.com/s/files/1/0431/7862/3138/files/surface_pro_annotation.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/peter_pan_y_wendy_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/5798793207.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/chainmail_armor_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/wevel.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5047/files/agency_theory_in_corporate_governance.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_off0000626a.bin
2817c70119829639b1a51322ead49d4c27caa8fa12d33680d72f9b545526d066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626A 5628 bytes
font_01_sfnt_off0000756e.bin
6dd7f1031a2c4163a519cfc9b99b96269b9a21928b34ef618fb0b616915087cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756E 10844 bytes

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