Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c3949f7105abc0…

MALICIOUS

PDF

41.0 KB Created: 2020-08-21 04:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f78bfa60fae4fcea61f2286c22779639 SHA-1: 2943a9ecdb461cf6ab81a97ea4c38907c097cdbd SHA-256: 49c3949f7105abc0f1f1e5dd074e6974d64265ea61b30667aa23057c34196c46
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a lab report. The document also features a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm used for SEO poisoning or to host malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document title and malicious URLs.

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=tensile+test+theory+lab+report
    • http://soratulep.thepetsalley.com/uploads/1/3/1/4/131406686/6378642.pdf
    • http://towinap.basingstokeconsortium.co.uk/uploads/1/3/1/8/131857920/migemuwu.pdf
    • http://files.honeybeeministriesiowa.org/uploads/1/3/1/8/131871692/34bb481100eeab.pdf
    • http://golileju.threesisterscommunityfarm.com/uploads/1/3/0/8/130874049/954656.pdf
    • http://wisedemiw.bodyprose.com/uploads/1/3/1/4/131438860/xirarewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/96664887401.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/baveziton.pdf
    • https://cdn.shopify.com/s/files/1/0429/5367/0822/files/mivowuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4651/files/86935178502.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/66740705981.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/biological_control_of_plant_diseases_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/wipokajujomaruwaxulugiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7642/files/97123131602.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/59029504306.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/99625072731.pdf
    • https://cdn.shopify.com/s/files/1/0443/6331/7404/files/74228425490.pdf
    • https://cdn.shopify.com/s/files/1/0435/1167/7083/files/subject_verb_agreement_indefinite_pronouns_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0437/files/phonics_2nd_grade_worksheets.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e1.bin
6579b2d1e2f169428402408c014f5c447a9fa99d3eb78b0bdc456c1bdce8c8c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E1 5100 bytes
font_01_sfnt_off0000722a.bin
8bd9dcb82f267cd69c7d4f41cb3e1116a85dcfb7e5889768199f2338ca6aa8a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722A 11100 bytes

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