Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f936c05b7c8178…

MALICIOUS

PDF

38.3 KB Created: 2020-08-29 05:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b82ddce1c6a05425a3c9eb1209c8fa3 SHA-1: afad798d073985a50c5fd58a698da89d902c3e5d SHA-256: 93f936c05b7c8178de95bc3059af935e3ae83c45de20c74463a37eee2957452c
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, disguised as 'Lewis dot structure practice answers'. This suggests a phishing or social engineering attack aimed at redirecting users to malicious content. The file also contains a large number of embedded links to static.usrfiles.com, which is flagged as a link farm, further supporting the social engineering pretext. No scripts were extracted, but the primary attack vector appears to be the malicious URL embedded within the document.

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.cc/wix?keyword=lewis+dot+structure+practice+answers
    • https://static.usrfiles.com/ugd/b8c837_d94b033543fd4ea18abc292643af1d68.pdf
    • https://static.usrfiles.com/ugd/b8c837_879096ab34394befbb45a06787a03215.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9a294d52d2842509db1068188766ead.pdf
    • https://static.usrfiles.com/ugd/b8c837_23cc11c78f5a41a39b4f3c4a94a46175.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fe3379d89804a858fd1180ceb513ba3.pdf
    • https://static.usrfiles.com/ugd/b8c837_62694bd5de174a3cbe575983660a3ff1.pdf
    • https://static.usrfiles.com/ugd/b8c837_13c6e15a2bbb44e0960c249ea6c64255.pdf
    • https://static.usrfiles.com/ugd/b8c837_807607779fc04239a6a21bfcf431a1df.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4506ad533c04849b2b77043daac6fa3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c97a82544fe94d92bc39cdba9a0d821c.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4731/files/astrology_answers_gemini_weekly_horoscope.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6608/files/97574122281.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_off00005537.bin
a6fe156b947ad611e9f43e6117ee22291523d0620b3a10d4d37055babc6c5783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5537 5068 bytes
font_01_sfnt_off00006697.bin
8d87f3da19be832369327d746c8f2633ba88d01e747ccc16528ce81c5a2f0d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6697 10680 bytes

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