Malicious PDF — malware analysis report

Static analysis result for SHA-256 2275e2ad3474e9f5…

MALICIOUS

PDF

44.5 KB Created: 2020-08-24 22:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c03e1f6d78b2f2f330919d205813203d SHA-1: 5b4fef0d9c7b6d7d89b0d10822a5d383d7dc3bba SHA-256: 2275e2ad3474e9f5a93b4c2b0ca27d3dc712d5a09587999e5ef86c963c521a66
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text fragments related to 'diagnostic answers' and the redirector URL itself. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination and potentially improve search engine ranking for malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=i+ready+reading+diagnostic+answers
    • http://files.davisonavenuepta.com/uploads/1/3/0/8/130813851/dakanokori.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1862/files/64666285564.pdf
    • https://cdn.shopify.com/s/files/1/0437/2342/3912/files/70703165933.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/how_to_make_fake_crack.pdf
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/6th_central_pay_commission_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/4695/2351/files/3_audio_songs_tamil_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/1625/5650/files/86355626178.pdf
    • https://cdn.shopify.com/s/files/1/0432/7689/4372/files/carbon_footprint_activity.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/632816095.pdf
    • https://cdn.shopify.com/s/files/1/0462/6812/1237/files/vue_component_external_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/8447/8632/files/atharva_veda_in_marathi_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/65046773224.pdf
    • https://cdn.shopify.com/s/files/1/0459/2287/7591/files/wotaditabutajikun.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/80183913072.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9489/files/bexibepinobazi.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_off000070fc.bin
2fc9ff29705f62c13709f5c3b7c796c94f2271dcee892238cdb5b0baca39a5c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FC 5208 bytes
font_01_sfnt_off000082d0.bin
377586a94e1a96e55a6c5d683d1ae172deb6d788cfcbd02cc81aa6d2480f2c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D0 10160 bytes

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