Malicious PDF — malware analysis report

Static analysis result for SHA-256 99889835fc0a1817…

MALICIOUS

PDF

41.1 KB Created: 2020-08-22 16:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75a583ff6e99789d8aaf57695713ac95 SHA-1: 53eda54a0c2179d97a216472508aa1db9fbebef4 SHA-256: 99889835fc0a18177cd27f56e365e15ba36b158df551f0d3f6edfd7104fb7165
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to a '360 degree performance appraisal feedback form' and includes the malicious URL. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify, likely to obscure the malicious redirector. The primary malicious IOC is the redirector URL.

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/pify?keyword=360+degree+performance+appraisal+feedback+form
    • http://files.chargingmoosemedia.com/uploads/1/3/0/7/130738876/repidoziw-karosewilulosin.pdf
    • https://cdn.shopify.com/s/files/1/0436/1755/0499/files/18848518294.pdf
    • https://cdn.shopify.com/s/files/1/0428/8721/7311/files/daguzetuti.pdf
    • https://cdn.shopify.com/s/files/1/0428/5199/1719/files/frankie_swimwear_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/bra_ket_notation.pdf
    • https://cdn.shopify.com/s/files/1/0448/1892/3686/files/princeton_review_sat_practice_test_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/the_falling_leaves_poem_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0418/files/autocad_lt_2020._1_update.pdf
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/ad_d_to_5e_conversion.pdf
    • https://cdn.shopify.com/s/files/1/0435/3468/0216/files/xogajiwopez.pdf
    • https://cdn.shopify.com/s/files/1/0438/3752/2080/files/pabovomixovogasebo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/62346149247.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_off00006035.bin
64e720a0099f8d8e41de1de2cde3be2100a388721b8f8e92e4a4a9ea951aeaff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6035 6044 bytes
font_01_sfnt_off0000749d.bin
6de7c0c322dea9f3b806e06411718dc164846f0929b865f2d116293b44f522ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749D 10284 bytes

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