Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15c71e5b17e2b92…

MALICIOUS

PDF

42.0 KB Created: 2020-08-15 23:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcd87f0d96cc712f0d7a7d35efbc9eb8 SHA-1: 2ca3eb048433b473b3d1ce78f43f8d143317f63a SHA-256: b15c71e5b17e2b924d3a01ca5a9a247491eada9f5e68bfbfa22c760207545deb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/wb?keyword=cancionero%20de%20guitarra%20facil%20pdf'. This indicates the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious infrastructure. 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.ru/wb?keyword=cancionero%20de%20guitarra%20facil%20pdf
    • http://files.thetravelvice.com/uploads/1/3/2/6/132682134/majajurimomipex-zafanazi.pdf
    • http://wiribapov.tracygardnerbeno.com/uploads/1/3/2/3/132303035/6050297.pdf
    • http://files.terrievoigt.com/uploads/1/3/1/3/131379134/ninajaxiza.pdf
    • http://files.simongarfield.net/uploads/1/3/0/7/130739084/9338426.pdf
    • http://files.nationalrpoclinic.com/uploads/1/3/0/9/130969046/1863214.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/30246631799.pdf
    • https://cdn.shopify.com/s/files/1/0429/5367/0822/files/brick_making_process.pdf
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/76608429623.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1526/files/technical_drawing_frederick_giesecke.pdf
    • https://cdn.shopify.com/s/files/1/0428/4533/9814/files/75015803496.pdf
    • https://cdn.shopify.com/s/files/1/0435/7862/2111/files/electrical_engineering_exam_papers.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/sapiruxufek.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5609/files/ritojebolizox.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/jexasonigavijodakobodex.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/rumesoviw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/check_your_english_vocabulary_for_ielts_test.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_off000061d4.bin
1ed8001e25822f2baec247d924405336888e031f842e88e9166ecb6c23699101
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D4 5048 bytes
font_01_sfnt_off0000730f.bin
178b58b956b68a4d2a1a1ffa22ead73a780974cf8ab05e5edc5a7ee0fc5cfcb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x730F 11804 bytes