Malicious PDF — malware analysis report

Static analysis result for SHA-256 618b8e326d8c1d48…

MALICIOUS

PDF

41.2 KB Created: 2020-08-15 03:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e7bd208fc2070ee369d88a7cbbd328a SHA-1: cf0749288b0bc0ee99cedf78c98653b4f38171cf SHA-256: 618b8e326d8c1d48308777148db23b958b4131555a0879be4ea6c7da2bc27f57
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links, https://ttraff.ru/pify?keyword=gsd+puppy+training+guide, is identified as a malicious redirector. The document's content, though heavily obfuscated, appears to be a lure related to a 'Gsd puppy training guide'. The ML classifier 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/pify?keyword=gsd+puppy+training+guide
    • http://files.jacobicpa.com/uploads/1/3/2/6/132695602/2811364.pdf
    • http://files.houseofnonie.com/uploads/1/3/0/8/130874382/memivikolizuwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5690/6911/files/foxupibezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pajovi.pdf
    • https://cdn.shopify.com/s/files/1/0448/3235/8560/files/let_learn_english_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/84036088335.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/tawutelowedigapabolek.pdf
    • https://cdn.shopify.com/s/files/1/0433/7644/3543/files/angular_formcontrol_disabled_valid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7430/files/17649479026.pdf
    • https://cdn.shopify.com/s/files/1/0439/7072/3998/files/san_agustin_de_hipona_obras.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/71262352812.pdf
    • https://cdn.shopify.com/s/files/1/0433/2978/1918/files/moruzixawawuviko.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006395.bin
54d6eab1dd77aca907787753ac8520e43eca47d1dc382c9441f8cb3c4f591f09
pdf-font-stream PDF embedded font (sfnt) at offset 0x6395 5228 bytes
font_01_sfnt_off0000757e.bin
0cf8c5dce1e80de94de2a2a5c03c4aca844a0259cb7b046ef0684af6d9a877a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x757E 10268 bytes