Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bce53125fcac079…

MALICIOUS

PDF

44.4 KB Created: 2020-08-14 07:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cfa0db176559e765c650c71e09dd93a SHA-1: 4344576919585c0c08dc950a1b22ad7452431ee5 SHA-256: 3bce53125fcac07935a2624f708bc9cf97bd852c281bfd57c3ddf48fdbb1dfe7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wb?keyword=pubarca%20e%20telarca%20pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a lure to a malicious site, likely for phishing or malware delivery.

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/wb?keyword=pubarca%20e%20telarca%20pdf
    • http://remolowo.laurakretz.com/uploads/1/3/1/6/131636725/suxulamavi-kopema-sawoxuvutuma-bozebikujipanu.pdf
    • http://sesabujid.eskmutherowingclub.org.uk/uploads/1/3/1/6/131606630/3250271.pdf
    • http://files.timberkreekcarving.com/uploads/1/3/0/8/130874595/ab19b9902.pdf
    • https://cdn.shopify.com/s/files/1/0434/9070/5574/files/nozukapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/94514097929.pdf
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/cell_city_analogy_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7592/files/kegetopoja.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/79766210479.pdf
    • https://cdn.shopify.com/s/files/1/0432/2410/5124/files/rokimebomaduwafijovok.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/79367546809.pdf
    • https://cdn.shopify.com/s/files/1/0449/9714/8830/files/58937472291.pdf
    • https://cdn.shopify.com/s/files/1/0433/8099/8302/files/11982652559.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6840/files/yamaha_moto_4_350_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/97584103310.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3857/files/11839133982.pdf
    • https://cdn.shopify.com/s/files/1/0433/3377/9611/files/bertoldo_bertoldino_e_cacasenno.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_off00006a94.bin
862c893abeff55cfb72e44826516360463b12423332825102c5c275c6930d1b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A94 5112 bytes
font_01_sfnt_off00007bfd.bin
b69df9c8038a40f92ebec5852e9df8ef289c5cdd605ad4964ba42833670f7229
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFD 13476 bytes