Malicious PDF — malware analysis report

Static analysis result for SHA-256 055551a71596b39d…

MALICIOUS

PDF

60.8 KB Created: 2020-08-13 23:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebcb9dc3b1ec3557f8ece4babf5bff81 SHA-1: ffddbbbbac2355f8bdb5722287298f0a2c67ba57 SHA-256: 055551a71596b39d525106ed9d3ba645360e362870e6ce69a8937bb463432309
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though partially corrupted, includes a URL that is also flagged as a malicious redirector. This suggests the document is designed to lead users to malicious sites, likely for further exploitation or phishing.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=antepartum+haemorrhage+management+pdf
    • http://files.wecanmarryu2.services/uploads/1/3/0/9/130969433/gawuraxu.pdf
    • http://files.caribbeanpsyarts.com/uploads/1/3/0/7/130739415/2951949.pdf
    • http://files.lfhhsonline.com/uploads/1/3/1/4/131453054/xibuvovifizede_gilomumerimab_zevagetudag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1980/4578/files/5_day_workout_routine_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/russian_formalist_criticism.pdf
    • https://cdn.shopify.com/s/files/1/0430/7343/7847/files/95514876242.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/90758366961.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/dubai_metro_map_high_resolution.pdf
    • https://cdn.shopify.com/s/files/1/0435/4506/7684/files/20618370789.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/vonagodozaju.pdf
    • https://cdn.shopify.com/s/files/1/0435/1347/9320/files/9904465876.pdf
    • https://cdn.shopify.com/s/files/1/0439/4981/8024/files/calculus_single_and_multivariable_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/aristoteles_metafisica_libro_2.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/nipalaladaviwujeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/6816/1184/files/tabizojabotiwazubejowuga.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7184/files/vexegumuzizex.pdf
    • https://cdn.shopify.com/s/files/1/0433/7644/3543/files/94032191886.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_off0000b148.bin
dc149d99ef72bd3fef71179fc7a42b4ade517a4274b621f7bb4482e3b14b6e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB148 5236 bytes
font_01_sfnt_off0000c2e7.bin
2692c8bffb6714b6f668ed59464373d33f1eecfcac111a4878c109bb9bf39633		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 10180 bytes

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