Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79a6d65b7a9a6fe…

MALICIOUS

PDF

36.2 KB Created: 2020-08-04 11:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4c22afbbbd04c2c8e700a2398f44d96 SHA-1: 3f72fd94831bdf342968db9e20f550b5cff25ec6 SHA-256: a79a6d65b7a9a6fead72bbe9467c672cfaf2019ed662d06e5246be5f7350ee05
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM. The primary malicious URL identified is https://ttraff.com/pify?keyword=tremble+chords+pdf+c. The document body is heavily obfuscated and contains some of these URLs, suggesting a content-luring or SEO spamming tactic. No scripts were extracted from this sample.

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=tremble+chords+pdf+c
    • http://files.kesselaarbv.com/uploads/1/3/1/0/131070711/ff044b0af2cd.pdf
    • http://files.takeaclasswithlaura.com/uploads/1/3/1/4/131407952/8441348.pdf
    • http://files.aliveleadership.com/uploads/1/3/1/6/131606901/f966e68bfd.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/99291065898.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/toefl_practice_test_sample_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/3817/0523/files/28901170242.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/73796641590.pdf
    • https://cdn.shopify.com/s/files/1/0436/7525/4937/files/26865080824.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/7996/files/55999313322.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0430/8487/3879/files/85971447769.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6469/files/48490525910.pdf
    • https://cdn.shopify.com/s/files/1/0432/3681/9104/files/46224541556.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/36466279951.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/18776243643.pdf
    • https://cdn.shopify.com/s/files/1/0435/5126/0823/files/20490503196.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_off0000459b.bin
ddfe1e4c4be32cbbb7301d7397a5713321a94b26a232479eff0ae7392c102d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x459B 4828 bytes
font_01_sfnt_off000055ec.bin
0a3e918514156bd0aa521072467337b8f9430af7291ea388bcd764dd3f8ff8a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55EC 9392 bytes
font_02_sfnt_off000075ff.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FF 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.