Malicious PDF — malware analysis report

Static analysis result for SHA-256 353372afe1ac8070…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 13:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e81eaad4cf42ab2bb84610f46d497da SHA-1: b684fd3e6ef0dac4c22873ce8ecac8f2d90303a9 SHA-256: 353372afe1ac80705346c27248845654514dfdec1c9dab83e893baf70a6be46d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a service manual. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or redirection attack. The PDF also contains a large number of external links, many pointing to Shopify domains, which is characteristic of SEO-based link farms used to distribute malicious content.

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=2015+sprinter+service+manual
    • https://static.usrfiles.com/ugd/b8c837_9626813987cf4cf2a2853db0e124cfbc.pdf
    • https://static.usrfiles.com/ugd/89363e_9b52a5da4c4044aa9a4fc721d5cbf755.pdf
    • https://static.usrfiles.com/ugd/b8c837_33ace708e8524835b9e9b6d815723726.pdf
    • https://cdn.shopify.com/s/files/1/0463/9693/2251/files/solomon_islands_national_university.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/dessins_de_sapins_de_noel.pdf
    • https://cdn.shopify.com/s/files/1/0472/3143/4917/files/49140420632.pdf
    • https://cdn.shopify.com/s/files/1/0428/6503/3383/files/ordinary_level_maths_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9871/files/wajiluzaputaliwaxepusob.pdf
    • https://cdn.shopify.com/s/files/1/0440/1761/4998/files/bepenejupokulabene.pdf
    • https://cdn.shopify.com/s/files/1/0434/6147/6504/files/cards_against_humanity_expansion_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0434/8254/6341/files/vuruvegelaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2417/0664/files/xoguxatebuguforila.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/11947701322.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2557/files/blitz_chess_tips.pdf
    • https://cdn.shopify.com/s/files/1/0435/3005/9940/files/fatevu.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_off00006370.bin
eb976ff04b51ed8bce2d84dcb6f51ad1c40a2b9bfa4c8d6e6f871424cb693688
pdf-font-stream PDF embedded font (sfnt) at offset 0x6370 5492 bytes
font_01_sfnt_off00007611.bin
3498f06eebade8d035e66f17394dd6f6d9c60ade3c27a7db02e4dda6eeb47f9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7611 14512 bytes