Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86107b4fcec9a82…

MALICIOUS

PDF

42.0 KB Created: 2020-08-14 16:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 369c44afa877d231fe76ab03cf848848 SHA-1: f6baa27dbc72e4e48922c1a4a92dd019875010e0 SHA-256: a86107b4fcec9a8202ab558112506e53b3f698a5ab1f183926a94add89c65036
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one pointing to a known malicious redirector (ttraff.com). The document body, though partially corrupted, suggests a lure related to educational worksheets. The presence of a link farm heuristic further indicates an attempt to distribute malicious content or engage in SEO abuse. No scripts were extracted, but the primary attack vector appears to be the malicious links embedded within the document.

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.com/pify?keyword=demonstrative+pronouns+spanish+worksheet+pdf
    • http://xilute.danielcont.com/uploads/1/3/2/3/132303027/firaw.pdf
    • http://files.gravitysuccess.com/uploads/1/3/1/4/131437756/6258607.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3574/files/python_automation_scripts_examples.pdf
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/passive_causative_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/7752/4888/files/jogagixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1144/8727/files/font_point_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0432/5638/1597/files/bilowurajotojovurajonutim.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8936/files/adrenal_gland_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/8380957890.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/bamitedawanaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058c8.bin
05666a95c5a292b621ed113819b35a6a4032e9aa8eb5acff7ff95902336d38fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x58C8 5348 bytes
font_01_sfnt_off00006adb.bin
b83d49d9442d4cb9676d1077fceba498787be5fb4269311581e8dfd060cea367
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADB 10024 bytes
font_02_sfnt_off00008d21.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D21 4324 bytes