Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b494a3c8317df6b…

MALICIOUS

PDF

42.2 KB Created: 2020-07-12 01:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 028ced1cd7388729cdcb984deb86ea47 SHA-1: 33b0bfa14494332d7cf797cb3e00873df2f3761e SHA-256: 0b494a3c8317df6bfba35ae174a5209fad5959102305110c6979bc8ddbb819f1
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a high-severity ML classification. The document body contains numerous embedded URLs, forming a link farm, with the primary suspicious URL being https://ttraff.ru/wb?keyword=robert%20w.%20boyd%20nonlinear%20optics%20pdf. This suggests the document's purpose is to lure users to malicious sites, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

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/wb?keyword=robert%20w.%20boyd%20nonlinear%20optics%20pdf
    • http://files.nymip.org/uploads/1/3/1/4/131437889/fegipidodugu.pdf
    • http://files.educationmosaic.com/uploads/1/3/1/6/131636678/6979851.pdf
    • http://files.neetje.nl/uploads/1/3/1/4/131406303/najibudopusat.pdf
    • http://files.lilyguillen.com/uploads/1/3/2/6/132682093/foxurasumakowuj.pdf
    • http://files.workinnvision.com/uploads/1/3/1/3/131384018/zudemesenodevakani.pdf
    • http://files.warrenmottboosters.com/uploads/1/3/1/8/131856308/9754813.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dokubonese.files.wordpress.com/2020/06/45922182798.pdf
    • https://dujexovumor.files.wordpress.com/2020/07/mekusap.pdf
    • https://suwasixutalo.files.wordpress.com/2020/07/xozagu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xidegafizupewutuzu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/1275695613.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86526592296.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/fejako.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97285982277.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/27405826645.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/41280343379.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/96203662281.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/71662792765.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_off00006811.bin
1a26fda038f0e5b1b1a7bd784834ebd98011c0d44bfb7691c57d7be937fbca60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6811 5312 bytes
font_01_sfnt_off00007a3a.bin
009b0408b4756ccea5dd4a2f769684dd297d92c6e56e73a96ae00c5d6241346d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3A 9784 bytes

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