Malicious PDF — malware analysis report

Static analysis result for SHA-256 7863c3ae0c592011…

MALICIOUS

PDF

55.3 KB Created: 2020-08-12 22:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f150a1cc35a5a38865a81bbb49a7877 SHA-1: aa78383b21367db5d4dbbbea03759609fb027250 SHA-256: 7863c3ae0c59201118de0d458f500b6d89d1ebb9a6b7f55ee82d79007a82bc87
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains URLs that appear to be part of this scheme. The primary malicious URL identified is https://ttraff.com/wb?keyword=algebra%20worksheets%209th%20grade%20pdf, which is likely used to redirect users to further malicious 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/wb?keyword=algebra%20worksheets%209th%20grade%20pdf
    • http://files.spaghettiplay.com/uploads/1/3/0/8/130813524/nerari_bubelug.pdf
    • http://files.aplitlounge.com/uploads/1/3/1/4/131437174/sokefiguguje_xaxasipojilije.pdf
    • http://rawedati.shopmade4her.com/uploads/1/3/1/4/131482975/rikelagemovakunajag.pdf
    • http://files.thebeamtravel.com/uploads/1/3/1/4/131454012/3152886.pdf
    • http://files.fusionlandscapedesign.co.nz/uploads/1/3/2/7/132710661/falinaravo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/45115583749.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5128/files/9945603346.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/nebuveraw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/tekexizetiwidize.pdf
    • https://cdn.shopify.com/s/files/1/0440/6883/1382/files/logical_reasoning_questions_and_answers_for_class_6.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/40878889042.pdf
    • https://cdn.shopify.com/s/files/1/0432/3485/3021/files/bhagavad_gita_in_sanskrit_with_tamil_translation_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0727/files/titiloguxa.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/aua_urinary_symptom_score.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/5380455819.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/vimetisulurigadade.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007846.bin
ebdcacd42b8b56c24530757b283c568c38a68a12ec8440e45694c75685a3ee32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7846 5744 bytes
font_01_sfnt_off00008bd3.bin
e95cede72d6974015055523d9030262e6b9e41d05f5a56515152b90931c61168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD3 15244 bytes
font_02_sfnt_off0000bb03.bin
06514985949027998cb069cac656318875dfb01ceaa7b201620f0295f45dc01f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB03 16096 bytes

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