Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a781160f4c289c…

MALICIOUS

PDF

54.5 KB Created: 2020-08-19 09:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f89a5fcdb6e9617d07a33c5ee576303 SHA-1: 2b5346e8b33e69f995c3c739a88658dd966a7500 SHA-256: 87a781160f4c289cd5bb26ab8c67b291fe4030c716e60980c5f50139aa590362
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though partially corrupted, includes the URL 'https://ttraff.com/pify?keyword=armature+deforms+body', suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm used for SEO manipulation or distributing further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=armature+deforms+body
    • http://files.oldsouldecor.com/uploads/1/3/1/3/131381722/3850965.pdf
    • http://neguv.authorkimberlymowery.com/uploads/1/3/0/9/130969633/buzedokek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/bogoxerof.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/29569212705.pdf
    • https://cdn.shopify.com/s/files/1/0431/4320/0929/files/internal_auditing_principles_and_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/sajar.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/4_your_eyez_only_dopefile.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/buffon_histoire_naturelle.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0189/files/16905253.pdf
    • https://cdn.shopify.com/s/files/1/0439/0230/4408/files/pearson_algebra_2_common_core_teacher_s_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/56409911402.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/90887156922.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/foxuvemonetewolebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0972/6888/files/68380678778.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_off0000751c.bin
30686034f02542e6100179981f38486a797634a5036ad7d3b7b760c38137110f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751C 3572 bytes
font_01_sfnt_off000081c0.bin
3968a7280619f6b245de53501b9c41909f48f82f6f40a1ed50a1e114b85560a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C0 5252 bytes
font_02_sfnt_off00009384.bin
b2ff34b1356b2b651e76788f45e583c9a5ba93763a1ed65117935a349088c056		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9384 10600 bytes
font_03_sfnt_off0000b7ea.bin
6f17b99764d671a96c0d2fd0b5f339513c2ddbf7efa5d755f63b897ad21dd613		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EA 16064 bytes

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