Malicious PDF — malware analysis report

Static analysis result for SHA-256 0655c084a4a4f62f…

MALICIOUS

PDF

46.4 KB Created: 2020-08-23 06:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffa983fde01ee118534c99683d67de1e SHA-1: 4a52ca457d2cdd6d5df017a844feb7b6dbc261ad SHA-256: 0655c084a4a4f62f828d6beb24f37de1124072cbffbd82fdf1e987984b5eac8a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests a link farm or SEO poisoning tactic to distribute 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.ru/pify?keyword=dictionary+english+for+pc+free
    • http://takakuw.dajfinewoodworking.com/uploads/1/3/2/6/132680813/995d750083ab52.pdf
    • http://wisopo.ceciliabramhallart.com/uploads/1/3/2/6/132681268/4798312.pdf
    • http://files.thedanceacademyofbarrie.com/uploads/1/3/2/3/132302999/volajalirejonewimefu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4882/8065/files/vepozadu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6703/1200/files/domidixajiso.pdf
    • https://cdn.shopify.com/s/files/1/0434/3427/9062/files/linking_verbs_worksheet_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0436/9891/3435/files/come_aggiornare_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/6310/5949/files/vafaveposejuvazipi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/xejudiwodot.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/telekinesis_learn.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/wuroz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2137/files/maratha_aarakshan_status_video.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/lijujebow.pdf
    • https://cdn.shopify.com/s/files/1/0429/1146/5631/files/travertine_pavers_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1571/files/ct_child_support_guidelines_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/soxapiwevuzorazuxanif.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/analepsis_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6027/files/medical_termination_of_pregnancy_1971.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_off000076d7.bin
70c6343302fa61e3ab42e7f2c62433a76287c11d0edd659780c0a813d0955c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D7 5380 bytes
font_01_sfnt_off00008926.bin
b0ba904f356e9b7acb651ef86a60ea83d6fe6b4e373f6dc04cdfb11adf97e8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8926 10628 bytes

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