Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff2530cc4c51d55…

MALICIOUS

PDF

42.3 KB Created: 2020-08-29 20:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f81016d24c5663886dc99560f102bf8c SHA-1: 216391e9bf257664fc635f10adc7dce6448c37d1 SHA-256: cff2530cc4c51d558a5c011a7fb874b568d26d41711b9ec699ca8661c380edd9
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This indicates a link farm or SEO poisoning tactic designed to lure users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains the same malicious URL and a benign-looking PDF link, suggesting a deceptive lure.

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.cc/wix?keyword=calisthenics+training+for+beginners
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/zolex.pdf
    • https://cdn.shopify.com/s/files/1/0428/6778/5884/files/6278373089.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/mekonozakagorugamegituxuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/1460/0342/files/bevasokifobejer.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/garageband_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0242/files/determination_of_calorific_value_of_fuel.pdf
    • https://cdn.shopify.com/s/files/1/0437/5370/1525/files/sajabopumelubupin.pdf
    • https://cdn.shopify.com/s/files/1/0435/9215/5295/files/badminton_court_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xomuburisuxenogiduta.pdf
    • https://static.usrfiles.com/ugd/b8c837_21fe94e3d5a3497fb541548c99922b70.pdf
    • https://static.usrfiles.com/ugd/b8c837_7056f474405147048f057f18428ca38b.pdf
    • https://static.usrfiles.com/ugd/b8c837_54747d7996d7449ebdc7dc3d22e5f778.pdf
    • https://static.usrfiles.com/ugd/b8c837_b84c6da799b543d1a62975f5d6b26b31.pdf
    • https://static.usrfiles.com/ugd/de65f7_98cd067f5b74466eba19d11e3a5a6b0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_37dda59325b84745b1f6d33c61e9f468.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_off00006804.bin
f66a31e31c076dcd03007c52ffc1c4158dcc23552b383dac39da811cb2ccff32
pdf-font-stream PDF embedded font (sfnt) at offset 0x6804 5188 bytes
font_01_sfnt_off0000799d.bin
efafd019935f5c5038c4fbffadb70a46c2ee99eea78ab9ec5335e7234d3943b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x799D 10248 bytes