Malicious PDF — malware analysis report

Static analysis result for SHA-256 988bb5ff12f2d7bb…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 06:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3da0cff8211efcd3c741dfc7f4ff0be SHA-1: 55adaa164c039f0ca3e786fed851eecbec759cae SHA-256: 988bb5ff12f2d7bbeda538d891c7cba9fbe06c497b761890d9685eb97679997b
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a critical heuristic indicating it contains a link to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious activity.

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.ru/wix?keyword=encyclopedia+of+monsters+jeff+rovin+pdf
    • https://static.usrfiles.com/ugd/451a43_fbd94b69f63c42b2b5df304e77a4cc9f.pdf
    • https://static.usrfiles.com/ugd/a18aa6_6acd129ebea54f2586881cf852d8e36c.pdf
    • https://static.usrfiles.com/ugd/405339_9b8a9901dbfa4a0480dfc9e627ba33ab.pdf
    • https://static.usrfiles.com/ugd/a474dd_a079daa0c3db472d83e1558e46c95fc8.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/29101497290.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/ferelebagesi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7606/files/99265738234.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/69081127180.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/92589400807.pdf
    • https://cdn.shopify.com/s/files/1/0440/1129/0782/files/25651113196.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6599/files/sexagijukedaromore.pdf
    • https://cdn.shopify.com/s/files/1/0434/3771/9717/files/sunoxelavid.pdf
    • https://static.usrfiles.com/ugd/b8c837_407d5e4746af4c31bf25596c3b9bd194.pdf
    • https://static.usrfiles.com/ugd/b7082a_34200b160b6a4a85bf1734c89161402f.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_8af25043bd5c4abca618504f4a7e4c7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b41ed9564edc49e481e31d1d9dac9b30.pdf
    • https://static.usrfiles.com/ugd/8e1900_daa36c84353f40ca8ca231954137974d.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_off00006831.bin
64a92b3806ec207359682fd8b9000b09b4fcaf1f89efd9ad348c34ad4e32dd62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6831 5496 bytes
font_01_sfnt_off00007ade.bin
6668e845ceb5d45d660281a1189505d15477f3d5239b340c467bc86de1626dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADE 10688 bytes

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