Malicious PDF — malware analysis report

Static analysis result for SHA-256 6631bf3f7078e345…

MALICIOUS

PDF

43.8 KB Created: 2020-07-29 17:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 063a14ab29b5598111c475900c567cf2 SHA-1: eaf5e026eae201039ba834d26fde1c4b113e9bb4 SHA-256: 6631bf3f7078e3456b3e3b177b1e45ccf0b0a0e4fe1ee50c01443df4d4f3e656
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'ap sachivalayam question paper pdf'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination and potentially spread malicious content. The ML classifier strongly flagged this PDF as malicious.

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=ap+sachivalayam+question+paper+pdf
    • http://files.littlegemscreations.com/uploads/1/3/1/4/131437421/d0108.pdf
    • http://files.texasredtoypoodles.com/uploads/1/3/0/7/130738673/gikibaz_wosixupemubawer.pdf
    • http://files.sluadg.com/uploads/1/3/1/6/131606984/81f77199.pdf
    • http://files.requestequestrian.com.au/uploads/1/3/2/7/132710565/firumegufu-tijepesof-mobuju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/98811370775.pdf
    • https://cdn.shopify.com/s/files/1/0428/4442/2310/files/5690473682.pdf
    • https://cdn.shopify.com/s/files/1/0431/4818/1666/files/95832903922.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5764/files/rawewiluvasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/gololawaxitebutopexare.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/jasukezegadumugeloxofazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/26167760991.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/bebuvevowezabasodos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/76820847513.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/nugifetenopewif.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_off00006de1.bin
37236f353681ef98e2821e1cdc057f9181a7c54ba5298dc546e6f7fe0cc842a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE1 5556 bytes
font_01_sfnt_off0000809e.bin
77e9b61f454dd264c7a9c4cab4565c9ad4a9a8eba0b88ee3a417c4c2d53c0c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x809E 9736 bytes

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