Malicious PDF — malware analysis report

Static analysis result for SHA-256 6295ba9baa005ace…

MALICIOUS

PDF

55.7 KB Created: 2020-08-24 17:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6266ea73822136bd7ccd7bddf7d5bfcf SHA-1: 6ab8a1ca466d53fe9d83ee5e509092ba0a959680 SHA-256: 6295ba9baa005aceb7460dc76d9a83b6933c004c20ca917757d466a95c93c5fb
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the lure to click on it. The presence of many embedded URLs and the ML classifier's strong positive prediction indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free+business+card+templates+psd
    • http://jogixa.xanderkarkruff.com/uploads/1/3/2/7/132710621/mumuradebo.pdf
    • http://files.suzannejefferies.com/uploads/1/3/1/3/131384113/nenuru-jugejov-jaxifukodola-zoxema.pdf
    • http://zitumo.lincolncommunityleague.org/uploads/1/3/1/8/131856369/sopuwasolifibi.pdf
    • http://files.slocampnpack.com/uploads/1/3/1/3/131398547/ca76e0.pdf
    • http://files.aniitsoo.net/uploads/1/3/1/6/131606819/kijabuker_kamasetov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/kodipalupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8181/files/alibaba_and_40_thieves_story_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7266/files/sistema_bethesda_cacu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/waxer.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/wesuti.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/singular_plural_nouns_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2793/1034/files/juvorabopatabo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1109/files/functional_analysis_sobolev_spaces_and_partial_differential_equations_brezis.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/21660619014.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8901/files/79030581629.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_off000092c0.bin
78e401069dfcaab9af05ad68d699fc8d985cdc56418e10f8d5e5f8dd3acbb832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92C0 5312 bytes
font_01_sfnt_off0000a4ab.bin
09710964bca27f025232fc27e37222349f4241f23ad2637536749b5e72c634e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4AB 13964 bytes

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