Malicious PDF — malware analysis report

Static analysis result for SHA-256 5534484ecf5c56af…

MALICIOUS

PDF

36.1 KB Created: 2020-07-25 17:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c776f40a57e6259f881f5f83672afbc7 SHA-1: 3103b6ef18c09472bec7fcd5a823b1188c2ff2ff SHA-256: 5534484ecf5c56af3dea313116348fe56a87475c81581a7388996f5f7415d005
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic firing for a PDF link farm. One of these links, 'https://ttraff.ru/pify?keyword=novo+cable+tray+catalogue+pdf', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and does not provide clear intent, but the link farm behavior suggests a phishing or malware distribution attempt.

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=novo+cable+tray+catalogue+pdf
    • http://files.crowenpress.com/uploads/1/3/0/7/130775969/xupofep.pdf
    • http://files.heatherpringhealthandfitness.com/uploads/1/3/1/6/131606003/d6d3d0.pdf
    • http://files.thoughtandbelief.com/uploads/1/3/1/4/131408432/16530a60aa5.pdf
    • http://files.kghypnobirthingsouth.com/uploads/1/3/1/3/131379877/aa49db207d94da9.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/bepizikalulajetokelafej.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/87580013071.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pekuxiwitijumowiviw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files/46319100562.pdf
    • https://cdn.shopify.com/s/files/1/0431/7357/6865/files/raruki.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/64707106418.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/gamefomali.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/33103196892.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/xefox.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/90491786260.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/57494985250.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/
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052f7.bin
0bc63c086cc579ddd85ee88310e31c0cee53d7eeae86caa226595ba2859bef9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x52F7 5144 bytes
font_01_sfnt_off00006497.bin
a075c923feb5aede0b3e09fbb83ea76038f604e2f75dbb37281a6020a0643d66
pdf-font-stream PDF embedded font (sfnt) at offset 0x6497 9088 bytes