Malicious PDF — malware analysis report

Static analysis result for SHA-256 55976ad4bb390a44…

MALICIOUS

PDF

40.4 KB Created: 2020-08-13 16:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02bb50bb7cf894ba5d58feabf449bdc6 SHA-1: 12cc7072417853b4f07156be60b60fa6f749c4d5 SHA-256: 55976ad4bb390a449a367fee4b4af20c090638938f6fd7de52a35156f0718579
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body, though heavily obfuscated, contains text related to 'biology textbook grade 10 pdf', suggesting a lure to disguise the malicious intent. The presence of a link farm further supports the malicious redirection pattern.

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.com/pify?keyword=biology+textbook+grade+10+pdf
    • http://gavadu.kirstenjoan.com/uploads/1/3/1/4/131453540/5360810.pdf
    • http://xinubejir.ashlypianocrafts.com/uploads/1/3/1/3/131381428/3e83f7955.pdf
    • http://files.campladder.org/uploads/1/3/0/7/130775971/mowepidiweguja_kekanixeketa_ninikuwiriwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3195/1517/files/synonyms_and_antonyms_worksheet_for_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0438/0200/1570/files/ortopedia_e_traumatologia_sbot.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/77550390423.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1066/files/52585925464.pdf
    • https://cdn.shopify.com/s/files/1/0435/3697/3983/files/ionesco_la_cantatrice_chauve.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/cell_mediated_vs_humoral_immunity.pdf
    • https://cdn.shopify.com/s/files/1/0432/0424/7715/files/37703361766.pdf
    • https://cdn.shopify.com/s/files/1/0437/0215/7466/files/engineering_mechanics_statics_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/25734424431.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/tirawa.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_off00005d90.bin
a4261f7b371ce885d8604a221409f8ec132419e119d22b6383f7b3daeb6bfadf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D90 5648 bytes
font_01_sfnt_off000070ea.bin
d93ef49ea9e6f68ea0a439aea124341fa49268b3cf7e77dbb6ec4aa272f7a67b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EA 10660 bytes

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