Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f09f3a6f4358335…

MALICIOUS

PDF

47.0 KB Created: 2020-08-23 17:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58d3899c370ad0c129e6c27cd8c72b7c SHA-1: a4c3e450d4749bd0ccfb8553f62ee8c58fbec411 SHA-256: 0f09f3a6f435833505283aa179fb9433efd4b9d64e282aacb6d3a168009b9a49
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The presence of a 'download button' heuristic further suggests a social engineering attempt to trick the user into clicking the malicious link. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a 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=admission+form+sample+format
    • http://rusilu.unitedchurchofhuntington.com/uploads/1/3/1/3/131398091/e958f83a066be3c.pdf
    • http://files.grimoirequest.com/uploads/1/3/0/7/130776592/sigupozikutovuz.pdf
    • http://files.dantramte.com/uploads/1/3/0/8/130813639/gurufujinuzusipikex.pdf
    • http://files.storeoutsideyourdoor.com/uploads/1/3/0/7/130776120/wowitamaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/ujt_characteristics_and_relaxation_oscillator.pdf
    • https://cdn.shopify.com/s/files/1/0431/4877/1477/files/arthritis_uk_hip_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/tapokulepufuvuxunaxigefaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1362/files/37020065394.pdf
    • https://cdn.shopify.com/s/files/1/0439/9231/8110/files/73263099016.pdf
    • https://cdn.shopify.com/s/files/1/0438/8729/6680/files/pofisidom.pdf
    • https://cdn.shopify.com/s/files/1/0459/7304/5415/files/lovoxatexitemofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/jabojiduli.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/73998764606.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/pujusubikewigizikiw.pdf
    • https://cdn.shopify.com/s/files/1/0445/7175/4655/files/1220297336.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_off00007615.bin
87948456803baad7d1244c2b89abc386ad308a577d142d82b85edf36d744fac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7615 5176 bytes
font_01_sfnt_off00008793.bin
336419d29a39e041dcc8d2484ca9bf81b875c86aa3badb4773ba1b4390be70a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8793 12320 bytes

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