Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbd0b84e14c397e…

MALICIOUS

PDF

37.1 KB Created: 2020-08-03 13:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72c166c3ef09c369187f6120df756a8f SHA-1: 79b0e76baf50dd0663f1d90604d99b301c1c12e0 SHA-256: 6cbd0b84e14c397ebc313b8bae5612567acedff2c4c2b2da2e788a036d25fdee
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting an SEO link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the nature of the heuristics point towards an attempt to lure users to malicious sites, likely distributed as a spearphishing attachment.

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.ru/pify?keyword=ielts+writing+task+1+academic+answer+sheet+pdf
    • http://files.wholistichelp.com/uploads/1/3/2/3/132302859/3404040.pdf
    • http://files.intuitivemew.ca/uploads/1/3/0/9/130969077/b02aa93.pdf
    • http://files.homefromhomechildcarers.co.uk/uploads/1/3/0/8/130873840/xawepoko.pdf
    • http://files.howardstantencoaching.com/uploads/1/3/1/8/131856433/495847.pdf
    • http://jujax.em2profiles.com/uploads/1/3/0/7/130739204/futudewekedi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/guvowejimonadeveweb.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5777/files/787751245.pdf
    • https://cdn.shopify.com/s/files/1/0433/5540/6494/files/bepiguvatazun.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/xapofa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/24531725333.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/befaladosomesojajuxokef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4833/files/83900640043.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/miriwo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1161/8462/files/avenue_q_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/college_physics_giambattista_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/49274607172.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73792904944.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/95790696455.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/firanuruxofalududelasasev.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_off00004c5d.bin
2e057dc757342c4aac958efb810e3486ec025404f9858419dd3a7491090c17b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C5D 5716 bytes
font_01_sfnt_off00005fc2.bin
03921cbdfcce3afc41eb66b4dd329bbdab858c85286457e66a9a30aaaaa3ef64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC2 14260 bytes

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