Malicious PDF — malware analysis report

Static analysis result for SHA-256 031dbfc84aae9c79…

MALICIOUS

PDF

51.0 KB Created: 2020-07-29 12:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c204db1ead172d1765b42522ff509647 SHA-1: 2cc43846914e755d95c0218fd2b16b2da4dd1c18 SHA-256: 031dbfc84aae9c797bbeacc2d4be7fe1d8fdf7aa7e40525d1f3b3ca26179b5e7
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 websites. One critical heuristic identified a link to known malicious redirector infrastructure, and another noted a large external PDF link farm. While no scripts were extracted, the presence of numerous links and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful content, likely as part of a phishing or scam campaign.

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=minority+group+definition+pdf
    • http://files.alexferguson.co/uploads/1/3/1/4/131453429/vefas.pdf
    • http://files.myinternationalfamily.com/uploads/1/3/0/8/130814129/vukururigu_sofalupisif_wakebowufazupe.pdf
    • http://files.terriermath.com/uploads/1/3/0/8/130813821/ferotumufagu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6726/0582/files/32853164219.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/tiwal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0366/5822/files/kitikitaneloziba.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/zaserinotupijutulo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/43137995938.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/89787187315.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/kazubuwetibux.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/21445422629.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/nomiwebivolidamakiserav.pdf
    • https://cdn.shopify.com/s/files/1/0434/8153/0534/files/sadut.pdf
    • https://cdn.shopify.com/s/files/1/0431/0961/3725/files/legepuxerijisube.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5193/files/252422327.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/nunurazageg.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/ropejozuxokab.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_off00008c88.bin
5a584f4a97ec041bc4222e8adbe76b52d7365ef8b8eaee7cf3e399970169cecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C88 4776 bytes
font_01_sfnt_off00009ce8.bin
cdfe3c97ff2f73899b434e25d9ed7b944cfca0dfb59e5e94622fbc6006c59717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE8 9992 bytes

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