Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c8924f01c8633b…

MALICIOUS

PDF

44.5 KB Created: 2020-09-01 05:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54ae0e1fec293398945894bcd2f13e73 SHA-1: 873f5436478bb3498d1ce656ab626537371999de SHA-256: 38c8924f01c8633b8dcb6a421bfa05d0d88a1b16da95932884f9616556e594fb
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, which is disguised as an academic worksheet. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to increase visibility. No scripts were extracted, but the presence of a malicious redirector URL is a strong indicator of a phishing or malware distribution attempt.

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=ap+calculus+continuity+worksheet
    • https://static.usrfiles.com/ugd/e33828_40bb29398f7440e390262056c290a13c.pdf
    • https://static.usrfiles.com/ugd/b8c837_39b62fde182245a490cdfdb8545c9830.pdf
    • https://static.usrfiles.com/ugd/b8c837_938f12be9ce94e7da0a1a48fb93daf60.pdf
    • https://static.usrfiles.com/ugd/2ac701_532ebd445fa94986bcf6d96dc7db5a8d.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5242/files/beneath_your_beautiful_sheet_music.pdf
    • https://static.usrfiles.com/ugd/b8c837_464caf8764254d4f9b7d54c1c6813de3.pdf
    • https://static.usrfiles.com/ugd/b8c837_007c84f8449f45b1aed9b09d4a4f3800.pdf
    • https://static.usrfiles.com/ugd/21e6f2_8e8e64fed3d3418a81715d01bf10fd59.pdf
    • https://cdn.shopify.com/s/files/1/0464/5499/7160/files/bajaj_finserv_loan_noc.pdf
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/brussels_sightseeing_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6632/files/tomb_of_annihilation_5e.pdf
    • https://cdn.shopify.com/s/files/1/0463/3929/3340/files/zaduxejofenowojalulabo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/2041653575.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/
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000619f.bin
352997400a6e24f24ef5178fd28d66dbe26071b183de6a5665d9cbfd770a162e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619F 5148 bytes
font_01_sfnt_off00007327.bin
59109cdb78dcfa25148383250287588147b6ba4ae5c031d04458446c5ad2ce88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7327 10484 bytes
font_02_sfnt_off000096fd.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96FD 4324 bytes

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