Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3c547bff5860c9…

MALICIOUS

PDF

46.8 KB Created: 2020-09-10 05:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4281f7168e76faae98635b39595c2a70 SHA-1: ccf2636b93926f00bffedbf7224cca36d95f4143 SHA-256: 0d3c547bff5860c9ea209d8a8db9c12237ce1f7b6c4ebe7b605e1aa3215f27af
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.link, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to interview questions. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or SEO poisoning tactic to drive traffic to 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.link/wix?keyword=vmware+l3+level+interview+questions+and+answers
    • http://files.amanapopcornandicecream.com/uploads/1/3/1/3/131380337/poluferasitafame.pdf
    • http://sojaf.shamanicpathandpractice.com/uploads/1/3/1/8/131871980/5860886.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9f2514_c8d180d26b9a41e99be1916ff92e0441.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_60362f6430104e99b02fb854fb868c95.pdf
    • https://static.usrfiles.com/ugd/b8c837_33addcbd8a7c4947b9607219c9691ddd.pdf
    • https://cdn.shopify.com/s/files/1/0433/8089/9991/files/3339090582.pdf
    • https://cdn.shopify.com/s/files/1/0460/3310/9156/files/honeywell_thermostat_user_manual_th5220d1003.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9459/files/ammonia_rocket_fuel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/gigiwidalosenelenojiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/gakofalojelug.pdf
    • https://static.usrfiles.com/ugd/865d50_e4651ea78a124a0dacd803e44866278e.pdf
    • https://static.usrfiles.com/ugd/b1277d_e243d2317b85403b8fff47fbd9bcf864.pdf
    • https://static.usrfiles.com/ugd/122077_ccc5c3cbcae24b098c90dbbc10ad59f4.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_off00007861.bin
f059c54c181a43adea9a58b1d617efbe4ce0525e038f5b3162e9226c66317332
pdf-font-stream PDF embedded font (sfnt) at offset 0x7861 5380 bytes
font_01_sfnt_off00008aa8.bin
7edc6cb8d64a9bb84bab71cc64127c4e6e06a84027222d54bebf2b05de6f02ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA8 10464 bytes