Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8c778912f1af20…

MALICIOUS

PDF

54.5 KB Created: 2020-08-09 12:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 979fd60d0b519239e26cfbbeacd2a0d2 SHA-1: 3e1c362389c4b388921bd2344ace955658c353f1 SHA-256: 5f8c778912f1af20c3fd8012e7556a6d294f2eea351dbcef0ff98f2ceae36110
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to a potentially harmful site. The presence of many external PDF links indicates a link farm, likely for SEO manipulation or to host further malicious content.

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=axolotl+short+story+pdf
    • http://mosorex.highwoodchamber.com/uploads/1/3/1/3/131379578/tixabopar.pdf
    • http://files.encognize.com/uploads/1/3/1/4/131453188/18f59.pdf
    • http://rofosukos.calliopeahc.org/uploads/1/3/2/6/132681670/8908876.pdf
    • http://files.readyactreview.com/uploads/1/3/1/4/131453302/tinojo-tujabewaz-zuzukumegifavu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/34482430581.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7526/files/33681159743.pdf
    • https://cdn.shopify.com/s/files/1/0429/5891/3689/files/bolerakopipa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/17537229321.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/calculus_analytic_geometry_larson.pdf
    • https://cdn.shopify.com/s/files/1/0427/7790/3263/files/philips_lighting_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0433/9453/1493/files/understanding_abnormal_behavior_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/salaruv.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/42109033647.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/2996/files/fejoladisilifupaburin.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/52134327683.pdf
    • https://cdn.shopify.com/s/files/1/0433/5167/0943/files/exercices_les_accents.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_off0000965d.bin
4a2a9f8cfff24909bf08b3bd99a47affc405eee3703207d5b746e4dc1540194d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x965D 5076 bytes
font_01_sfnt_off0000a7ab.bin
1815e1c455a2fd7da9731dfece6de54247bc21e81d525cb9cec7ac33ac9ae52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7AB 11000 bytes

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