Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab9b35cb8bd63ff…

MALICIOUS

PDF

40.2 KB Created: 2020-08-15 01:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8dacfb42d5c6e6ab555b0426ad535d5 SHA-1: 47e9c768485e2bfaeedd11a4d5d5faddc0ca06f4 SHA-256: dab9b35cb8bd63ff79d14e5370e8133ba6b5fd5f8cb81bb45eca1cfbeeb36350
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body text, though partially corrupted, suggests a lure related to an 'admit card'. The primary malicious URL is a redirector that likely leads to 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=mah-+mba%252F+mms-+cet+2019+admit+card
    • http://zifofina.rocmazeng.nl/uploads/1/3/2/8/132814930/cef6688b0d50c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ganisififado.pdf
    • https://cdn.shopify.com/s/files/1/0434/6521/2066/files/uk_bribery_act_guidance.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1866/files/biblia_de_estudio_apologetica_holman.pdf
    • https://cdn.shopify.com/s/files/1/0433/0648/3876/files/ragemifupovaligare.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7093/files/guru_pendidikan_agama_islam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45484104345.pdf
    • https://cdn.shopify.com/s/files/1/0431/0243/7527/files/perab.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/49638669918.pdf
    • https://cdn.shopify.com/s/files/1/0432/2282/7165/files/werigufogazuta.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_off00005d75.bin
b21e09c2325fa52522721483408a6e75490c40e12b10320655e2433cc3658bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D75 5844 bytes
font_01_sfnt_off00007142.bin
82691b94e8df44f817824e09e393a2631f9b731421fb4279d1dc66a142a4f0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7142 10296 bytes

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