Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4194cb4a69ebb4a…

MALICIOUS

PDF

38.0 KB Created: 2020-08-31 03:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e32d4bdd749088f294ca58c955764d3d SHA-1: d2219ef351fe40301a654961708fa605d056b5b4 SHA-256: b4194cb4a69ebb4a2e7c2b2fe624631cd7a4fbeada66a904eaee93ccfac2773e
154 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'free employee engagement ppt templates'. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL.

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=free+employee+engagement+ppt+templat
    • https://cdn.shopify.com/s/files/1/0439/4863/8363/files/precalculus_with_limits_a_graphing_approach_4th_edition_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/30633351388.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/nober.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/59666350839.pdf
    • https://static.usrfiles.com/ugd/c63dba_0303fbc27ad941cab62b46f9bbba1096.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6570/files/64993517268.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/73662841357.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/how_to_tame_a_triceratops_in_ark.pdf
    • https://cdn.shopify.com/s/files/1/0434/1229/1751/files/brushed_cotton_fitted_sheets_super_king_size.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4933/files/97316090257.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/88203749733.pdf
    • https://cdn.shopify.com/s/files/1/0436/6260/6489/files/66946720073.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_off00005861.bin
ab6a56968a7c39b5368190ab7b89cac2371c43225e753a8a5457c45f54a12486
pdf-font-stream PDF embedded font (sfnt) at offset 0x5861 5016 bytes
font_01_sfnt_off00006965.bin
47eef1a362ade77235e6f8c257ec0cc646fff32d6a82f26caa06a9df997215e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6965 10044 bytes