Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecce51ab26bbd5d…

MALICIOUS

PDF

42.1 KB Created: 2020-07-31 13:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc872c5c400620fa69fa1a0d59434be3 SHA-1: 0115cba185c6ff9d484cdf58e88b639a3923f106 SHA-256: fecce51ab26bbd5d879d1d69d7271365e0148857b51f8fd0b20bf7f43de8ff48
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link-based redirection.

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=affairscloud+pocket+pdf+2020
    • http://files.benjamingilpin.com/uploads/1/3/0/7/130738765/253f43abea2150.pdf
    • http://files.warmnightcandles.com/uploads/1/3/1/8/131856212/825bbbdad24f307.pdf
    • http://files.bsjmun.org/uploads/1/3/1/6/131606094/d927fc0d5.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/xozolepubopovaxatifokum.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0432/files/59698206296.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/davonozurixipiwatizopi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3435/files/wazeberusobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1187/files/givumosipige.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0438/files/wadibuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/99973203772.pdf
    • https://cdn.shopify.com/s/files/1/0431/3468/1250/files/89544461894.pdf
    • https://cdn.shopify.com/s/files/1/0437/8407/7473/files/bupazesilomo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/bebovemelawoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/vuwovitapawagegarovaguvew.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8375/files/mamufebunop.pdf
    • https://cdn.shopify.com/s/files/1/0428/3888/4519/files/66361184885.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/1/0428/7424/1187/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ab.bin
780f7a7a1c142b5a92b7c1d5ff466d03a361d0654d1d1dab8aebd22c060931a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x66AB 5252 bytes
font_01_sfnt_off0000789a.bin
2ddd996dc335f95bc1bb092e181eed645d9f1cf9ad279fda4726970da39d5817
pdf-font-stream PDF embedded font (sfnt) at offset 0x789A 10212 bytes