Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af81e39d18175f3…

MALICIOUS

PDF

64.5 KB Created: 2020-07-26 09:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b36dda441889fb300eec4bdda2b22745 SHA-1: f839ed0cf81ac3cd405cbcd02002c30e4a85b1f5 SHA-256: 7af81e39d18175f36b56ca14a43cafb950fe4cbf0b3b61b14a1a5a0f8a7f0953
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, likely for SEO manipulation or to distribute malicious content. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence point towards malicious intent, likely to redirect users to further malicious sites.

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=schema%20ampli%20audio%2012v%20pdf
    • http://files.losachicboutique.ca/uploads/1/3/1/3/131379085/2802117.pdf
    • http://files.justgobarefoot.com/uploads/1/3/0/8/130813301/bamibuvag.pdf
    • http://files.hiringandhousingforum.com/uploads/1/3/0/7/130738997/neperemisi-gudawu-nolatokud-kezolugud.pdf
    • http://files.clonmelglassandmirrors.com/uploads/1/3/0/7/130739593/154654.pdf
    • http://files.mindfulness-et-sport.com/uploads/1/3/1/6/131637570/zumawizisitukep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4420/8789/files/fisaviduf.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4135/files/23413913639.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/74084938118.pdf
    • https://cdn.shopify.com/s/files/1/0432/4740/3168/files/50073617749.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/53643628703.pdf
    • https://cdn.shopify.com/s/files/1/0431/1662/6082/files/netaviregizimudinolej.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/85434829747.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7202/files/32816045812.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/81754225637.pdf
    • https://cdn.shopify.com/s/files/1/0435/3359/8880/files/goxadejagilekawa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/bevir.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/94148422837.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_off0000b871.bin
7e0ed11e16d91ce09a0c4255242f0566a1c60514519064f7f9f70d38248a29e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB871 5164 bytes
font_01_sfnt_off0000ca0f.bin
0871fbdf95d8253deeb524eb46d770f1bee908c7d4133dcec261d77a2fa8c19e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0F 13776 bytes

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