Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f8b443236e2033…

MALICIOUS

PDF

66.2 KB Created: 2020-07-31 08:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfe78ac5fd074765f6a77a1d931bc97c SHA-1: dde6fa8e8a4e08138a95c158c6fd836d300fb933 SHA-256: d2f8b443236e2033879417ea8a0da4bc9fcb85ca038dfa55c4c58f869b2eb990
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be malformed or obfuscated, but the presence of the malicious redirector URL indicates an attempt to lure users to a harmful site. The PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links were generated, likely to obscure the malicious destination.

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/pify?keyword=paddy+chayefsky+pdf
    • http://files.primarydigit.com/uploads/1/3/0/8/130873983/9311228.pdf
    • http://files.northcountybands.com/uploads/1/3/1/4/131437750/wuwumud_besiguju_tuvivekuwakowi.pdf
    • http://files.ledmonkeytactical.com/uploads/1/3/0/7/130738914/namiwolu-wujipavajub.pdf
    • http://files.kokmatoys.com/uploads/1/3/0/7/130739971/1962791.pdf
    • https://cdn.shopify.com/s/files/1/0428/5104/1447/files/51088807044.pdf
    • https://cdn.shopify.com/s/files/1/0428/4026/0775/files/xorufewajiwaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/pusukunuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/sojedofof.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/18526525395.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4280/files/26588907615.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2145/files/tigakixuvezetibebi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/lemik.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/lisumuloxodewafevav.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/nonemofarigavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/xopusakamisegilejixafarat.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_off0000c860.bin
255e7d708873cbd10d2f6826846fc8c7ede90d92e8feb558f18682b69d2cb865
pdf-font-stream PDF embedded font (sfnt) at offset 0xC860 4724 bytes
font_01_sfnt_off0000d87d.bin
9d36d73f481006196062e3bc426c1605e7e8e4e2fe1af9da2146ab85c70fae4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 10324 bytes