Malicious PDF — malware analysis report

Static analysis result for SHA-256 341a0f1f7f61d3d5…

MALICIOUS

PDF

51.6 KB Created: 2020-08-08 20:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26853dc7787253605cfbd13ba3231c0c SHA-1: 0208a314a8d1c9970f33ee63fac9d0125ae144e4 SHA-256: 341a0f1f7f61d3d543c9a42bdc4a8cf2d388af2b1ca8c98589e4e29771916d3f
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to a 'simple web design proposal'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic. 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.cc/pify?keyword=simple+web+design+proposal+pdf
    • http://jugavox.beadsbraidsknots.co.uk/uploads/1/3/1/4/131409090/womagufoge-ketetenubumor-rojimogip-towivo.pdf
    • http://files.acoustictheologian.com/uploads/1/3/2/3/132303035/6868d0b80.pdf
    • http://files.khang-le.com/uploads/1/3/1/8/131856430/832111.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/nitelubebazokumidefab.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/basics_of_networking_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/9336/7710/files/zigodad.pdf
    • https://cdn.shopify.com/s/files/1/0434/8506/9478/files/simplification_and_approximation_for_ibps_clerk_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/52648694018.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/keturapavexureritexobudes.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/6024782283.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/norojubigowisatukojovoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/6902/2109/files/pedapobuniluluz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3491/0618/files/83793999085.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6117/files/68861260038.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_off000089bd.bin
b5a89b67d7d2daaaa5e29e7478e2b21530fa39ca20d5fa41520c227c9679ba15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BD 5696 bytes
font_01_sfnt_off00009d0d.bin
cf22c20cace3865bc6edae0a204e622f045909598988a3386715e4f24a799585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0D 10740 bytes

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