Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c88a90e740c17b…

MALICIOUS

PDF

40.0 KB Created: 2020-08-11 14:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab2a2b10d2616af29e0c14e5aff832e5 SHA-1: bd7da7a2294318dac944e047bcdfe14f4c3ac6ef SHA-256: b1c88a90e740c17b3ea8094b1ddcf906461d2cb8e787b96863f3f758255611e8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded URL `https://ttraff.com/pify?keyword=either+or+neither+nor+grammar+pdf` is likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, contains this URL and other benign-looking Shopify links, suggesting a lure to a malicious domain.

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=either+or+neither+nor+grammar+pdf
    • http://files.thesunnymom.com/uploads/1/3/1/8/131871494/lenojuti.pdf
    • http://files.renzoeats.com/uploads/1/3/2/7/132741385/firaduduv.pdf
    • http://files.rainshadowsolar.com/uploads/1/3/0/7/130739712/9228089.pdf
    • http://files.creeksidearbour.com/uploads/1/3/1/8/131871864/fifutodov.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5974/files/school_attendance_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/faxumurile.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1822/files/89144954641.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/37980273887.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7261/files/watataxigatavirajidodizoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/keyshia_cole_take_me_away_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/8668830713.pdf
    • https://cdn.shopify.com/s/files/1/0439/3933/2251/files/fallout_4_mod_list_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/77974835347.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/ycmou_ba_1st_year_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/que_es_acreditacion_universitaria.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/4_c_s_of_marketing_mix.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_off00005d16.bin
9fd33414ada6b3f39a7d9ac8e147ac0cbf83f6e228f3ecd2ae57ab2cd11b3c15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D16 5204 bytes
font_01_sfnt_off00006e9f.bin
5b2c34da0523e726bff4020af335e116b9f061f28bf37903cf9d67b2bc9e330d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9F 10288 bytes

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