Malicious PDF — malware analysis report

Static analysis result for SHA-256 923ac45ae672ce8b…

MALICIOUS

PDF

58.7 KB Created: 2020-08-13 18:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75c5ce465379acdc32c6f38f7f9ee5b5 SHA-1: acd8095062d69b6258419b4c143bfd3b93e3b336 SHA-256: 923ac45ae672ce8b80b2f8a7d93e03a51976a38da7a85a55b582909195c68e86
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. The primary redirector URL identified is https://ttraff.cc/pify?keyword=bowflex+xtreme+2+se+assembly+pdf. While the document body contains garbled text and metadata suggesting it's related to 'wkhtmltopdf', the heuristic firings strongly indicate a malicious redirection attempt. No scripts were extracted from this sample.

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=bowflex+xtreme+2+se+assembly+pdf
    • http://files.goldenspiraldesigns.com/uploads/1/3/0/7/130740232/5083549.pdf
    • http://kekunu.littleriverartscouncil.org/uploads/1/3/0/7/130740178/8815592.pdf
    • http://wefezafe.victoriakileart.com/uploads/1/3/1/4/131437375/tadirijexilik.pdf
    • http://mijesoweg.newcaneyband.org/uploads/1/3/1/4/131453150/supuwizi_sisuwivegutex_guvado_welisiruneweleg.pdf
    • http://zodise.tcfastpitchchampionships.com/uploads/1/3/2/6/132681670/1fbe3803b.pdf
    • https://cdn.shopify.com/s/files/1/0429/6087/9772/files/8629545224.pdf
    • https://cdn.shopify.com/s/files/1/0434/0350/9914/files/news_intro_music.pdf
    • https://cdn.shopify.com/s/files/1/0439/3166/4552/files/libro_caballo_de_troya_6.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0759/files/english_grammar_opposite_words.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5694/files/nimugixezutasole.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7546/files/problemas_de_angulos_entre_paralelas.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/chuyn_i_t_sang_nh_dng_hnh_nh_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/tumalodigato.pdf
    • https://cdn.shopify.com/s/files/1/0438/8939/3816/files/amigos_para_siempre_satb.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/43128118753.pdf
    • https://cdn.shopify.com/s/files/1/0429/2316/3801/files/12_traditions_of_na.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000b3b7.bin
5f85a5aacb0b719185a697ed67b84278d4e40cc9d38967e5587d2e502630392c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB3B7 23192 bytes
font_00_sfnt_off0000584c.bin
fd37ff2f0ba15eead2e2a350facf2a53e1bb8f4dd0a182c2b3b0e170774e5090
pdf-font-stream PDF embedded font (sfnt) at offset 0x584C 5768 bytes
font_01_sfnt_off00006bee.bin
ba8215e2e66d530edf5d2fe97ebfc4fa53148a81ab239936a11598aeffd787bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEE 12856 bytes
font_02_sfnt_off00009345.bin
383656162b2d1345005d633c56ad0a500c7c0a8e7739dbf27452850203431746
pdf-font-stream PDF embedded font (sfnt) at offset 0x9345 9692 bytes