Malicious PDF — malware analysis report

Static analysis result for SHA-256 625cf7edfccfe8f6…

MALICIOUS

PDF

76.5 KB Created: 2020-08-11 23:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09825ad0305c29fc55b0bd646ba3d9ca SHA-1: 1617036564c67052e09968529625e5f639c02489 SHA-256: 625cf7edfccfe8f6fd4bd3ca4c947ff22aea6ae00d2829b8b14c898d47aa9bed
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=create%20pdf%20form%20in%20c#'. The document body, though partially corrupted, also contains this URL, suggesting it's the primary lure. The presence of a large number of external PDF links, many pointing to benign Shopify domains, indicates a potential SEO link farm tactic to obscure the malicious redirector. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

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/wb?keyword=create%20pdf%20form%20in%20c#
    • http://files.laughingbuddharetreats.com/uploads/1/3/1/4/131453530/59898.pdf
    • http://files.christhamilton.org/uploads/1/3/2/7/132710627/699823.pdf
    • http://dijig.tcblb.com/uploads/1/3/1/3/131379858/ddc47315d1a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/zerazifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/86099445053.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/98578530711.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/lufewosaritexeriwemigagi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9674/2815/files/karusope.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/95797155413.pdf
    • https://cdn.shopify.com/s/files/1/0437/2047/4779/files/saga_cazadora_de_hadas_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/17906842390.pdf
    • https://cdn.shopify.com/s/files/1/0429/6438/5951/files/dizekabulivutawidodonav.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4454/files/elephant_love_medley_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/jumbled_up_sentences_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/24643013793.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/27984089880.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_off0000eccf.bin
429dcf4795ff702734f4df0e7b32720023ed46d8b594be677eeb91cf88697c1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 4996 bytes
font_01_sfnt_off0000fdba.bin
5cccbcc2156e1fdec5dd6f1480f9c5e7199597396889b208a890d30342466a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 12304 bytes

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