Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a246e3ca557a013…

MALICIOUS

PDF

36.5 KB Created: 2020-08-21 20:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cba1c20f42211ad8c8f5d34e285c2f95 SHA-1: 4d8d2cf84f64f7e60ac46d81789b3c410ac69527 SHA-256: 5a246e3ca557a0136cc6cda68062969d0bd26235ad724992878fb4723ad61cb0
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=hush+imdb+parents+guide'. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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=hush+imdb+parents+guide
    • http://files.searscommunication.net/uploads/1/3/0/7/130776855/10728ecd.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/ielts_fever_listening_test_17_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8359/files/18358864552.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/storyline_360_slide_templates.pdf
    • https://cdn.shopify.com/s/files/1/0433/9784/1063/files/autocad_objective_type_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/cachexia_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/water_absorption_test_for_concrete.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/9290809303.pdf
    • https://cdn.shopify.com/s/files/1/0434/5384/1560/files/shoulder_impingement_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/7308231631.pdf
    • https://cdn.shopify.com/s/files/1/0434/1419/2285/files/gokepenuv.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_off0000511f.bin
ec7d15b247ad5312018b82ac65d242d4d4dbf780f48ec06880d07fd10b4ff8f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x511F 5440 bytes
font_01_sfnt_off00006361.bin
935d5ff6bfa109125f5c0a107127faf2bc6e98950b4d0d361d087a982ac16676
pdf-font-stream PDF embedded font (sfnt) at offset 0x6361 10008 bytes