Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7d76f3c9c4dfaa…

MALICIOUS

PDF

46.7 KB Created: 2020-07-26 10:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 113ffaa827fd135d18aaf0d475015b0d SHA-1: 3a408b1cd1e8b997694562ad1cfaccc8395e9feb SHA-256: 2b7d76f3c9c4dfaa9317fba6f5904b0aebe8de3fb7ab870fec3798bcb87a665e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains embedded links that point to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, appears to be a lure related to a calendar. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a malicious intent to redirect users to harmful sites. The ML classifier also flagged this PDF with high confidence.

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=calendario+2020+argentina+pdf+con+feriados
    • http://files.thatwallpaperstore.com/uploads/1/3/0/7/130740391/88bf59cecbaad.pdf
    • http://files.artfullyyours95.com/uploads/1/3/2/6/132695438/modomati_vakozul_vujirifagojeba_jowifodurozub.pdf
    • http://files.corechangehealing.com/uploads/1/3/0/7/130775762/nitim.pdf
    • http://files.mynttl.com/uploads/1/3/1/8/131858540/vilipalufiwet.pdf
    • http://files.corechangehea
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38743570217.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/53890111027.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0428/3141/3404/files/lujagumujid.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/48654861569.pdf
    • https://cdn.shopify.com/s/files/1/0439/0833/3736/files/tosidefipajevuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/34329624859.pdf
    • https://cdn.shopify.com/s/files/1/0434/7222/4421/files/32045560635.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92313200312.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/85079926671.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/pajetunorazukewuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sivuduveserekolagaxabulux.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/wesesurivevixixamaboteluf.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_off0000766b.bin
234f02faec5143faea2af3323ad2b6d33d2236ec541cce7a7ed009038a001015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766B 5408 bytes
font_01_sfnt_off000088df.bin
6435a11d7a6afdfe5a438cf4272fe74e1a33d04f1d874883df47686a8e4e67e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88DF 10676 bytes

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