Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b55b944e1274ecb…

MALICIOUS

PDF

53.6 KB Created: 2020-08-12 06:39:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5d8727b8426adcf7fdc1a09c667a7ac SHA-1: 17d3e1a4d5308f5b7d0267cbf0bf2477e4d9ab9d SHA-256: 5b55b944e1274ecbe7e58dfae45cb11dbbce4e35c5633c7d6dbda331749d9aed
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, includes the same URL, suggesting a lure to download a malicious file. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to drive traffic to potentially 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.ru/pify?keyword=management+principles+and+organisational+behaviour+pdf
    • http://xebufejat.cafeoflifekalispell.com/uploads/1/3/1/4/131407901/8219914.pdf
    • http://jiwer.harrisburgelementary.org/uploads/1/3/1/3/131380429/9073748.pdf
    • http://files.saidivinefoundation.org/uploads/1/3/0/8/130874633/wetuxeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8093/1733/files/ruzevoxupafoda.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/94587557703.pdf
    • https://cdn.shopify.com/s/files/1/0432/1869/8400/files/cambridge_pet_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/1209/4109/files/btec_health_and_social_care_unit_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/kezotesiteribinizexewo.pdf
    • https://cdn.shopify.com/s/files/1/0446/9764/9306/files/orb_of_sweet_demise.pdf
    • https://cdn.shopify.com/s/files/1/0434/4522/3581/files/kuzumabozaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/best_employee_award_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/90694156415.pdf
    • https://cdn.shopify.com/s/files/1/0432/6830/9152/files/how_to_use_bootcamp_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/jiwopotomani.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/ladovojizagukaraserudo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008418.bin
db49c1847ef92a3f3673c5fbd8c119c8508ea62fba04b7c2f28af64ae2c00724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8418 5656 bytes
font_01_sfnt_off00009727.bin
b23de3723ebe347a2592dd3086cbafe394860fc7fdd0a7a27eeed474879c72e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9727 10500 bytes
font_02_sfnt_off0000bab8.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB8 4324 bytes

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