Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf91343e4a1fd897…

MALICIOUS

PDF

50.9 KB Created: 2020-08-07 21:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d3c4236e5dddfec445e960e42c42beb SHA-1: 1ba4a341b4c7a24e5494f3ec690565acc6b665f3 SHA-256: bf91343e4a1fd897e6fac34fcdf5112c0cf580c74246d47a86af6be4f0a14e47
120 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, with a critical heuristic identifying it as a PDF link farm. One of the primary links directs to a known malicious redirector service, 'ttraff.com', which is likely used to obscure the ultimate malicious destination. The document body itself is heavily obfuscated and contains the same redirector URL, suggesting the document's purpose is to lure users to malicious sites.

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.com/pify?keyword=calculus+3+pdf+kenyatta+university
    • http://files.alphachichico.org/uploads/1/3/2/7/132740234/2485425.pdf
    • http://files.sylverdesign.com/uploads/1/3/1/6/131606331/88d7deba1b8da3f.pdf
    • http://files.abingtonpsumetz.com/uploads/1/3/0/9/130969390/gurux-pazukiwesitep-wigili.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/cricket_score_sheet_t20.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/xefosabarapeluguwibinogi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/31263187907.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/98911639783.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/lexus_is250_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0932/files/world_of_greyhawk_folio.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lenibokufilitixesokan.pdf
    • https://cdn.shopify.com/s/files/1/0431/7996/6628/files/castle_story_winter.pdf
    • https://cdn.shopify.com/s/files/1/0431/0309/2898/files/pretty_print_json.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/java_foundations_3rd_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/kadosowutito.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_off000081db.bin
b0368ffe7b9fc314224fad5d020186d1ac3a24d6e60d9d12f8444c94365f205c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DB 5444 bytes
font_01_sfnt_off00009478.bin
e8cd51a4d08e2549c8b27945c292c77f5e8dd8f7bf781729a7cab31dd372ad9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9478 13248 bytes

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