Malicious PDF — malware analysis report

Static analysis result for SHA-256 f361f47cd42d7b65…

MALICIOUS

PDF

44.8 KB Created: 2020-08-18 21:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e996155c7f7223bfb742cd8281dcf25 SHA-1: 99ad3fe32210b6d043b4f4bb310084948600eb31 SHA-256: f361f47cd42d7b654d341fe02b50040922e3f94bdeabeed9c42449f7f4549d75
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves redirecting users through malicious infrastructure via these embedded links.

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.cc/pify?keyword=bootstrap+3+form+validation+plugin
    • http://mipunolis.victoriasongweisoprano.com/uploads/1/3/1/4/131483281/xubij.pdf
    • http://zelow.syedmohsinakhtar.com/uploads/1/3/2/6/132682883/somufumexifexowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/tuvoje.pdf
    • https://cdn.shopify.com/s/files/1/0430/5177/8202/files/robinson_crusoe_book_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/84046870671.pdf
    • https://cdn.shopify.com/s/files/1/0428/9645/7884/files/roxevisagovekefon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/battle_chasers_nightwar_android.pdf
    • https://cdn.shopify.com/s/files/1/0438/4774/5698/files/adding_dissimilar_fractions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/zuvuzasaparidob.pdf
    • https://cdn.shopify.com/s/files/1/0440/2721/6037/files/bhutan_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1993/5655/files/66851914466.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fa2.bin
a7134bea1678164f7eb20ca4caa43d49fc42ddbfae9060795985672d186033a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA2 5632 bytes
font_01_sfnt_off000072bc.bin
187a07f99a2cb6558aa3623a07b65ee9969b2a93773629b75e04e6dc3f18a33b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BC 15664 bytes

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