Malicious PDF — malware analysis report

Static analysis result for SHA-256 741c4554f33f2d07…

MALICIOUS

PDF

56.4 KB Created: 2020-08-10 14:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6601fba231861f7aeae0fa6a6d72c478 SHA-1: f439be0b77ba0622233bc837d1093fdab4ce5528 SHA-256: 741c4554f33f2d07a15a1b49a5875e3ead800b6b19f35139dacac6abb155bf42
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Ccna exam pdf free download', suggesting a lure to trick users into clicking malicious links. The presence of many external PDF links, some pointing to potentially untrusted domains, further supports the malicious intent of distributing unwanted or harmful content.

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.com/pify?keyword=ccna+exam+pdf+free+download
    • http://zexipuz.jencolby.com/uploads/1/3/2/6/132695384/8191049.pdf
    • http://gerugidib.springfieldfrontiers.org/uploads/1/3/1/4/131482976/6319942.pdf
    • http://files.fitnessfactory1.com/uploads/1/3/0/7/130739567/3499249.pdf
    • http://files.wearedbp.com/uploads/1/3/1/4/131483147/nesotujebofamaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6369/6805/files/csr_harmony_wireless_software_stack.pdf
    • https://cdn.shopify.com/s/files/1/0449/6562/6015/files/chaminade_flute_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/bivarapowosijefasawikoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6521/3089/files/10255465392.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/2797772827.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1532/files/27976960390.pdf
    • https://cdn.shopify.com/s/files/1/0432/5965/8398/files/momag.pdf
    • https://cdn.shopify.com/s/files/1/0430/9870/1977/files/98726980669.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/pojanifitutudode.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/vedarudevon.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/gfebs_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/1801/8216/files/jelojunaropow.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/john_deere_7000_planter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/mapilosuxagumoxudanom.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6487/files/asymptotic_freedom.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_off00009655.bin
02f041bcb2d30cdc887521039ab85600f3b48c37b0cd24b6ffb915b6d8e4325e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9655 5188 bytes
font_01_sfnt_off0000a7ed.bin
c46dfb9777ecb114a1f8ca443c742ec7fc009dc8e6a18ff54ab0d27a11045df8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7ED 14332 bytes

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