Malicious PDF — malware analysis report

Static analysis result for SHA-256 186e2080fe37445b…

MALICIOUS

PDF

53.7 KB Created: 2020-08-08 19:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb14553fdae3b317cda53800b5d42614 SHA-1: 75ba407aed2f31c4e5eb67be6ab3c05bc3251677 SHA-256: 186e2080fe37445bd909cbf392779b00453c5bd3b0b25792c279aa6dd32d1d44
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=manuel+pour+apprendre+le+japonais+pdf', likely leads to a malicious site. The document also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=manuel+pour+apprendre+le+japonais+pdf
    • http://files.voicesbubble.us/uploads/1/3/0/8/130813362/xipofutexulasaz.pdf
    • http://kuvofopod.derbyshiredaleswinesociety.org/uploads/1/3/0/7/130739415/wekoga.pdf
    • http://files.cvhs-bands.com/uploads/1/3/0/9/130969364/jipabixegivis-patojujo.pdf
    • http://files.architectureindetail.com/uploads/1/3/1/3/131380995/ronefuk_dotobut.pdf
    • http://pubefafo.brdge.org/uploads/1/3/1/6/131637814/zibuxurozoterun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/amla_plantation_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/37663520035.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/english_abbreviation_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/4371374161.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/dabedam.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/26031716614.pdf
    • https://cdn.shopify.com/s/files/1/0429/5920/8604/files/64541668728.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9024/files/latin_roots_prefixes_and_suffixes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/18949557522.pdf
    • https://cdn.shopify.com/s/files/1/0433/8476/6620/files/26617525446.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6534/files/zugigokadufazatu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72163988246.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/sabipinaxelesazagak.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082f9.bin
a8961ae3cc41d6b8135dca81d3dcaefb691d00adafa63c2dca32f1a99a55e874		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F9 4920 bytes
font_01_sfnt_off000093b8.bin
8693c59d47e36fc9eccecde74b678597f417a052bc35b94e17778aee2b290b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93B8 12228 bytes
font_02_sfnt_off0000b9aa.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AA 4324 bytes

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