Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdb568b4a58fa61…

MALICIOUS

PDF

57.7 KB Created: 2020-07-31 17:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 954bb275e9726c565d7ec5437dd85e9f SHA-1: 5a716381ddadb95e3f5c808353e60348281a35ee SHA-256: 5fdb568b4a58fa6112e915ba2f4a171d8b27ad4a038c7e2e645238ed75d11c40
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector identified by the heuristic. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt, aiming to drive traffic to malicious sites.

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=flip+table+emoji
    • http://files.moniquebosshardcurby.com/uploads/1/3/0/7/130775393/kujefimewutej_lejesunorofidiv_vewuwuvinero.pdf
    • http://files.sacredsalontahoe.com/uploads/1/3/1/3/131382808/4423168.pdf
    • http://files.dennishorseshoes.com/uploads/1/3/2/7/132740270/442f637.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3920/3229/files/rujanovubifejulotuganur.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/75924300563.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/80789130824.pdf
    • https://cdn.shopify.com/s/files/1/0429/5357/2515/files/jobibavelevejevefozejone.pdf
    • https://cdn.shopify.com/s/files/1/0437/2378/4360/files/24946903180.pdf
    • https://cdn.shopify.com/s/files/1/0431/7711/5810/files/98619579865.pdf
    • https://cdn.shopify.com/s/files/1/0433/1244/7652/files/47303079316.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/podipomobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9631/7845/files/pogatulukalilozejag.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/45773248265.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/58533821791.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000802d.bin
1cf91a4c377a7e664b4aea49a400f619dae851c0ff856e39146b250d1c062003		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802D 4544 bytes
font_01_sfnt_off00008f9b.bin
315377da6a070f84f15f5ff502e5cd2ca3923d55aa71538676c7ce2a22e4fc0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9B 10544 bytes
font_02_sfnt_off0000b3e1.bin
a6b23c92f20070c175b3326ca1441e178b5c6fbbb25c846a3ee244d7b7ea99db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 17024 bytes
font_03_sfnt_off0000cbc3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 4324 bytes

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