Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd398e318a93714f…

MALICIOUS

PDF

42.2 KB Created: 2020-09-08 01:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d549e06ac3b04ae7789c8cc6d10f9bba SHA-1: e2eecf535744f5b4b13572713bbe0647a2f10286 SHA-256: cd398e318a93714fc403cdf9705ce21eb097cfb8f33268ec882bb4551dfafa00
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to the presence of a redirector link pointing to `https://ttraff.club/wix?keyword=asvab+prep+plus+kaplan+pdf`. Additionally, it contains a large number of external PDF links, many hosted on `cdn.shopify.com`, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness. The document body contains garbled text but includes the same URL as the redirector.

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.club/wix?keyword=asvab+prep+plus+kaplan+pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0730/files/59130389182.pdf
    • https://cdn.shopify.com/s/files/1/0428/6660/6247/files/37459399797.pdf
    • https://cdn.shopify.com/s/files/1/0434/8972/2534/files/88322548075.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2093/files/54874484198.pdf
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/49675637362.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_fc7fefc11ec8420eae1ae3e920d1548a.pdf
    • https://static.usrfiles.com/ugd/217d68_5a19ba3e97734b0eab9b9c560f1c9b58.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8474/files/jesuledevarodowigulig.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9616/files/1712370229.pdf
    • https://cdn.shopify.com/s/files/1/0434/5475/9069/files/fakowaxevuminemisabiwit.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/43199633047.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4601/files/sidatovabevunino.pdf
    • https://static.usrfiles.com/ugd/26481d_160b4a549a094bedaf41f975b2299096.pdf
    • https://static.usrfiles.com/ugd/89363e_66224e5a4fec4e1fa1d3971a9c5e9aac.pdf
    • https://static.usrfiles.com/ugd/c0fca2_4615c5f7d544489198ef6c180322770d.pdf
    • https://static.usrfiles.com/ugd/fc840b_0238b05edad447dfb71065bda4174f59.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_off0000678c.bin
844d3599933618b0b212ca5026dcc15d215c7ce825bb91a97f48c8c38d70fc05
pdf-font-stream PDF embedded font (sfnt) at offset 0x678C 5288 bytes
font_01_sfnt_off0000799c.bin
f154fb039b2713971f146d1d21997c81670d2a6d01d03df0d9230f34003073d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x799C 10208 bytes