Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a13eea4f21cdec…

MALICIOUS

PDF

42.3 KB Created: 2020-09-08 21:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ecd64cc390cff65c0e57eee59b3194d SHA-1: a13df2f26a1f101dda711c21e95ca3c06d41a173 SHA-256: 60a13eea4f21cdecce6ac72a2ff8b6cbff8f65980855f2b05c0ff49066c6fe1c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=adobe+pdf+reader+for+win+10', is designed to lead the user to download a malicious payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/wix?keyword=adobe+pdf+reader+for+win+10
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/1b8612_7d04788101ad4dd58592e9144f8dbbc1.pdf
    • https://static.usrfiles.com/ugd/2b3f46_7f994520d84248d1abe2f7f681d4d6ed.pdf
    • https://static.usrfiles.com/ugd/bfbc46_a71ee4c3d75441f1b91781c9ffddd9f4.pdf
    • https://static.usrfiles.com/ugd/c8a981_a4dc33d379de4a73940a3f2f09113b5c.pdf
    • https://cdn.shopify.com/s/files/1/0430/2526/8889/files/freddie_mac_mortgage_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/3968/5799/files/satidabekimawege.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/33271451462.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/calculus_2_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/bowenudomagavu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/60390158236.pdf
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/46670332141.pdf
    • https://cdn.shopify.com/s/files/1/0432/9675/1771/files/witisakisuwusatakoronej.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b30.bin
b2bdfcf56c7897e1ab90d78af564d9d67ec0acc8ca04fba23f77fe0f810ece6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B30 4948 bytes
font_01_sfnt_off00006c13.bin
003d3dc0f2076457e71c6f8e73b639b8de2c482571da8b176045a409f869314c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C13 10008 bytes
font_02_sfnt_off00008e4b.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4B 4324 bytes

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