Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa891e9f00627d7b…

MALICIOUS

PDF

40.6 KB Created: 2020-08-30 12:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 470aa15dcd2b640005c2a38b3c73500d SHA-1: 30a2d84244972a53a1b73fbf241817de6323d9cf SHA-256: aa891e9f00627d7bc2c365fefa46cb1aab731c3ff4da75fd13effe2abea55088
128 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.ru/wix?keyword=stages+of+chihuahua+labor', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure. The presence of numerous links points towards an attempt to distribute malicious content or phish users.

Heuristics 4

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/wix?keyword=stages+of+chihuahua+labor
    • https://static.usrfiles.com/ugd/2813e2_5927cb5c69af4535871b695d158f67e3.pdf
    • https://static.usrfiles.com/ugd/1a89c8_e46614c975bc474bbdac9b894721a9ac.pdf
    • https://static.usrfiles.com/ugd/6f7357_dc545512f323473ea158aa38a1bcb496.pdf
    • https://cdn.shopify.com/s/files/1/0438/3929/1554/files/pufetufilo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9849/5389/files/pdf_to_mp4_converter.pdf
    • https://cdn.shopify.com/s/files/1/0428/6123/2294/files/bathroom_vocabulary_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/5687/4151/files/90833327185.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/brush_lettering_alphabet_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/android_screenshot_shortcut_change.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5400/files/apa_citation_format_example_with_multiple_authors.pdf
    • https://static.usrfiles.com/ugd/bb13a2_5963b327a1ea4337af42f553785273ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f19988edcee4f85a9c29f7c89c210ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8cb6a49217443a2bd38dc59a5914f8a.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_off0000613f.bin
bda4e8b1048e3f474d16667bf3cc5e23c4f291d088a478fa24578012a62a05e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613F 5384 bytes
font_01_sfnt_off00007380.bin
ee9f2108399c32b6be491e22a3d147d8ae070fc7f545308a63f50bfd95ebabd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7380 10080 bytes

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