Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a13510376da4aad…

MALICIOUS

PDF

95.3 KB Created: 2020-08-09 12:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfa17acbdc244324629bcd7e3680a13b SHA-1: 26abc1cb25c11d86a7a2be530a9ccd2d87d9fad8 SHA-256: 0a13510376da4aad4bd640f4fbe6ade451f5fa05f07faafa2589cc396cdc04de
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, pointing to 'https://ttraff.cc/pify?keyword=inkblot+test+pdf'. Additionally, it exhibits characteristics of a link farm with numerous external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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=inkblot+test+pdf
    • http://files.paloaltochineseschool.org/uploads/1/3/1/3/131380005/lekut.pdf
    • http://files.companionsofchrist.org/uploads/1/3/0/9/130969375/3234800.pdf
    • http://files.wabiphotography.com/uploads/1/3/1/3/131379134/ziwetepo.pdf
    • http://nexaguxir.philipdallmann.com/uploads/1/3/0/8/130874284/5591249.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/anemia_carencial.pdf
    • https://cdn.shopify.com/s/files/1/0433/5858/4986/files/archicad_19_keyboard_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0430/1294/8121/files/29916348344.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/carmina_burana_o_fortuna_score.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/tauren_druid_forms.pdf
    • https://cdn.shopify.com/s/files/1/0440/0798/1214/files/1562241269.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/77996641210.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5804/files/studio_ghibli_piano_sheet_music_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4220/files/adobe_online_collaboration.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6549/files/city_of_endless_night.pdf
    • https://cdn.shopify.com/s/files/1/0436/2141/7122/files/6453184467.pdf
    • https://cdn.shopify.com/s/files/1/0433/5396/4702/files/algernon_blackwood_the_doll.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/xitavareva.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/ansys_fluent_14._5_tutorial.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013222.bin
ad72a62a0112fd04952a8859c212503e408fc32f492ca7b2b8aba565bb575d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 4868 bytes
font_01_sfnt_off000142c5.bin
90652f320f392085612014ac70fd65ac1364a3e996d0f7a064adcae5d6dae889		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142C5 13780 bytes

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