Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4762130420bf31…

MALICIOUS

PDF

40.6 KB Created: 2020-09-01 01:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bec20ca11d01b31497e36a6bdab885f4 SHA-1: 279386d319c5b6abb5e78d8bfbbaf1b7d70dc621 SHA-256: ba4762130420bf31eb673fa8f3b2a3d8d8dd03f31bc09d8987609a90886517a5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a direct link to a known malicious redirector, ttraff.com. The document body, though partially corrupted, suggests a lure related to 'decision making skills interview questions and answers' to entice users to click the malicious link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/wix?keyword=decision+making+skills+interview+questions+and+answers
    • https://static.usrfiles.com/ugd/5fd5c1_18a96201a6cf40fa938a4dc32b0b3ff3.pdf
    • https://static.usrfiles.com/ugd/6f58fb_5ae954656fc14259a1f4184a21ac6c73.pdf
    • https://static.usrfiles.com/ugd/10e3af_331f1abea01545708eaaba23996a3fb2.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_155fa54090294118959b0eafc1c36501.pdf
    • https://static.usrfiles.com/ugd/e3834b_8ba9f5381fa84e82a54056bd47152fa0.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/95611223004.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/44766207361.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kexikebesadunav.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/76858877499.pdf
    • https://static.usrfiles.com/ugd/8cbfce_7cafc37e08c44162b7808475ee6714ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a1a1ea9071436fa46061a6bd567d35.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_off000060f6.bin
a6dc0d19fd3b8146d8480e3e98085cfd75a637e0f1ae3260d5cbe83308506c79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F6 5600 bytes
font_01_sfnt_off000073fa.bin
3046e2ec7e66e5f1c6d1b72c531d4a0917616f45d3e88f86156353d61e1bb59a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FA 9836 bytes

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