Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b86f9cdf06ed590…

MALICIOUS

PDF

40.6 KB Created: 2020-08-23 05:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe248f296e6d4c2b2cbdbecf491bdfd4 SHA-1: 45dec6d80cb975f23de780a9716a0d79cc1658ab SHA-256: 1b86f9cdf06ed590bbcd9dd21e036e5b3c9f587ac1040fb11476bc408e6a85b2
120 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to appear as a resource for crossword puzzles, but it redirects to malicious infrastructure. The primary malicious URL identified is ttraff.com, which is flagged as a redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating deceptive content. The presence of numerous external links, many pointing to Shopify domains, further supports the SEO link farm heuristic.

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/pify?keyword=crossword+puzzles+pdf+middle+school
    • http://files.diversityunitkncirg644.com/uploads/1/3/2/6/132682676/besigu.pdf
    • http://fexurob.shelbyveterinaryservice.com/uploads/1/3/0/7/130776783/ca35eeb19b.pdf
    • https://cdn.shopify.com/s/files/1/0436/3704/7449/files/dolphin_browser_for_windows_10_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6117/files/56811530478.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/crop_evapotranspiration.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/mogoruva.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/62068173890.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/49470943963.pdf
    • https://cdn.shopify.com/s/files/1/0438/7235/4459/files/wirujovatavonajezutojupa.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/96954796459.pdf
    • https://cdn.shopify.com/s/files/1/0436/9665/2442/files/football_squares_online.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_off00005fe6.bin
3d5d78aa37069ad037291d54f898026eea53b2fec0a3a1fb46716e24f53582b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE6 5232 bytes
font_01_sfnt_off000071a7.bin
db00e1f2d996468dc2e9815ea14d80c438fad86f8255adca17fa3bf18b25e72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A7 10568 bytes

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