Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a86f5de9d95986d…

MALICIOUS

PDF

43.6 KB Created: 2020-08-20 03:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 624729e9397f574c9fafb1e460f8ab7e SHA-1: 0ff5df502359a2138cc7fe9128a97183c08cca7b SHA-256: 6a86f5de9d95986d4dad291a02bb17f9a31e8e2b5184e5e64883307ce88dd14b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to deliver a second-stage payload. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a brochure download. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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=eicher+pro+2049+brochure+pdf
    • http://files.strictlyskillsbasketball.com/uploads/1/3/1/4/131411596/fixutul.pdf
    • http://files.theprestigemaids.com/uploads/1/3/1/3/131380756/3b9c784ea1ce2.pdf
    • http://files.moldingminds.org/uploads/1/3/2/7/132741429/zitininasegarup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/21925542220.pdf
    • https://cdn.shopify.com/s/files/1/0433/3315/7014/files/aparato_respiratorio_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0447/5250/2935/files/rafutaxikibefekopefug.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/nukaxojaru.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/noxofenidumodove.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/gijubixiluzufuribu.pdf
    • https://cdn.shopify.com/s/files/1/0448/2465/8082/files/52146831909.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9815/files/97305748135.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/gubimalewejagof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufabolip.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005732.bin
3778d85dd3cb26b5e8dc30eb5815f3e20ef29c6ba34bac3dc71973c6a9f78d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5732 5436 bytes
font_01_sfnt_off000069a6.bin
a7f67e9612dbd95ecd413d6a605853e5423ffe3219c9d07cc4aa7d5210d4c760
pdf-font-stream PDF embedded font (sfnt) at offset 0x69A6 10152 bytes
font_02_sfnt_off00008c93.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C93 16164 bytes