Malicious PDF — malware analysis report

Static analysis result for SHA-256 63573cb5cbd46e4c…

MALICIOUS

PDF

43.6 KB Created: 2020-08-18 22:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5809de85a91afda03376476f40528b1 SHA-1: f5ba92ac5ae558c214d4131120b3447c339cfc55 SHA-256: 63573cb5cbd46e4c59498e9e99ecb7bddb6a56ef8daeb9a082efb4889be3c281
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious content. The document also contains a large number of links to external PDFs, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic to increase visibility. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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=fact+family+worksheets+grade+3
    • http://files.lindyfurby.co.uk/uploads/1/3/1/4/131412558/pejamegupubugez-setuf.pdf
    • http://karaw.khja.org/uploads/1/3/1/6/131637789/9d9a2cd.pdf
    • http://jewonegi.abcoindustrialsales.com/uploads/1/3/0/7/130776819/139634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/6321/2192/files/archaeology_and_anthropology_relationship.pdf
    • https://cdn.shopify.com/s/files/1/0438/7163/3563/files/might_not_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/nekanapebepujo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/77964770412.pdf
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/kajawet.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0850/files/92591264434.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/vubesegemak.pdf
    • https://cdn.shopify.com/s/files/1/0434/3978/4103/files/rusikikazusel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9147/7159/files/lofokirogajovugufezete.pdf
    • https://cdn.shopify.com/s/files/1/0447/8818/7293/files/intermediate_accounting_15th_edition_test_bank.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1682/files/berker_1930.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055f4.bin
59c27b06b4ba59d94b38f768e06f8bacec018e3974ff210c1a3ebea56c493bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55F4 5812 bytes
font_01_sfnt_off000069b9.bin
56ac0e87a1138b38696d6cb81cbacaed01c538446754d6bad4e93517dd3ebeaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B9 10024 bytes
font_02_sfnt_off00008c43.bin
586fd2d47d7ef655ac8fcedaf3a17ac43b55ee34544d24df6525aba8b365c669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C43 16116 bytes

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