Malicious PDF — malware analysis report

Static analysis result for SHA-256 898645c837648901…

MALICIOUS

PDF

53.9 KB Created: 2020-09-07 02:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c11d594f982e494ef0f24690cdc84869 SHA-1: 49d54fba016c1544788bddbfd33de2545d1d36d3 SHA-256: 898645c8376489016cb296ebe31ebd4f1c05e17759c3a8e21fe065b7bf7fd9ab
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about simple fraction equations. It also features a link farm of numerous SEO-optimized PDF documents, with the primary malicious URL being https://ttraff.club/wix?keyword=einfache+bruchgleichungen+pdf. The ML classifier strongly indicated maliciousness, and the presence of multiple external links points to a content-luring or redirection strategy.

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.club/wix?keyword=einfache+bruchgleichungen+pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/office_manager_cover_letter.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6510/files/62287502572.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/application_form_jelentse.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/venutijoxibazesusuredate.pdf
    • https://cdn.shopify.com/s/files/1/0431/9602/2933/files/british_army_bugle_calls.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9280/files/murop.pdf
    • https://static.usrfiles.com/ugd/b444d4_af5bb23320404019a56d5f521b9ff2bb.pdf
    • https://static.usrfiles.com/ugd/60e703_0a0b05295dde48079a69a698636e7a0b.pdf
    • https://static.usrfiles.com/ugd/fe83c3_13a293d5743f46d0a30fc68e9c3447dd.pdf
    • https://static.usrfiles.com/ugd/269bb8_af823fa105224405bd2370b737d84784.pdf
    • https://static.usrfiles.com/ugd/086daf_6fbf4199c99945aea6e12674dc0db428.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_0981cfd8768d45d29b7da79637268a80.pdf
    • https://static.usrfiles.com/ugd/50de67_1f5e9eb3ff934664913884afa95d83bd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072d2.bin
c3838d887670e2ae4080429b61772ec2c796bb73454bbdeba6f7734852db6150		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D2 5336 bytes
font_01_sfnt_off000084f1.bin
ffaad21b0f196534daa6a27acd5cbb1367ac3ba659936a2e73269cdaf2e22c03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F1 15192 bytes
font_02_sfnt_off0000b463.bin
9f210c878511d8597a835643ef4d0a47fa2eb54e3d07ae8e94db1374f705e886		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB463 16088 bytes

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