Malicious PDF — malware analysis report

Static analysis result for SHA-256 751f776bf60f0453…

MALICIOUS

PDF

49.6 KB Created: 2020-08-06 01:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: defd5f142c5bb3dcda615aa1f77fb65f SHA-1: e73c3feda638d7d9e9b4c6d7af9ff249c8034a7a SHA-256: 751f776bf60f045346d07f09414fb351b57dc5f67acca0ae7ad9d930b4d50ce7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=common+laboratory+apparatus+and+uses+pdf
    • http://files.murrayfreedomfestivalne.com/uploads/1/3/1/4/131407802/vopuvebub_nadufanunuda_fopofopefazimo.pdf
    • http://files.common-ground-communication.org/uploads/1/3/0/7/130740458/b1fc3f5c7abf.pdf
    • http://files.awarenessofnothing.com/uploads/1/3/1/4/131409755/burutowadi-rakogomiduf.pdf
    • http://files.musky-lures.com/uploads/1/3/1/4/131482887/e8457.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/lawesixozuganajeje.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/pufesolagiriravigufurona.pdf
    • https://cdn.shopify.com/s/files/1/0435/6630/1343/files/escience_labs_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/34631833091.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/werewolf_artifacts.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3791/files/auditory_phonetics.pdf
    • https://cdn.shopify.com/s/files/1/0437/7726/1729/files/31015626611.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/35108291982.pdf
    • https://cdn.shopify.com/s/files/1/0432/4042/3592/files/dulusaruxer.pdf
    • https://cdn.shopify.com/s/files/1/0435/7967/0689/files/33258730589.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/45228038586.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/nys_45_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0439/files/2945266278.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_off000084ca.bin
4d44cfe06c3da096a108f2530e85b549bb081914bc09207f7e69a74120c18e73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84CA 5332 bytes
font_01_sfnt_off000096ce.bin
8f2198bc643c5f875245ea936ea90d340ca21dc048d67ac62e6c71fd134f2292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96CE 9956 bytes

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