Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab773c0f33e7b9d…

MALICIOUS

PDF

46.8 KB Created: 2020-08-11 21:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27d5a4691e69bfd45a0e99774f656ed2 SHA-1: adbe0d53194a9710be02cb7771d2a7c050f1e94e SHA-256: cab773c0f33e7b9d72e2827fad8b9bf543ef047b7314dc23442ac06096b11b7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm behavior, with numerous links to shopify.com domains, likely for SEO poisoning or to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to a malicious site via a deceptive link within the document.

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=br%25C3%25BCche+k%25C3%25BCrzen+%25C3%25BCbungen+pdf
    • http://files.bonziblend.com/uploads/1/3/2/8/132816066/fajowinogov.pdf
    • http://jidanes.mdcsmith.com/uploads/1/3/1/4/131407005/sovetiminupal.pdf
    • http://files.georgesweeneyarchitect.com/uploads/1/3/0/7/130739719/8363314.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/39413714731.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/nudur.pdf
    • https://cdn.shopify.com/s/files/1/0435/7318/2625/files/funivogulinuri.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/38857468428.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/62021541567.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/febiselimisip.pdf
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/lezokaxijodusometugeni.pdf
    • https://cdn.shopify.com/s/files/1/0439/9919/9390/files/23015715808.pdf
    • https://cdn.shopify.com/s/files/1/0434/1537/1932/files/dirt_devil_power_express_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1943/files/kajesejil.pdf
    • https://cdn.shopify.com/s/files/1/0428/8430/0959/files/conus_medullaris_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0435/0482/8580/files/bimemaxizakedet.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/setifanoletexomidudufire.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006867.bin
fd14f02726646e1631e2e3335d945e5ed2bf34be8b1aae8a3b402ae901706ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6867 5064 bytes
font_01_sfnt_off00007963.bin
40947f182835a163440083f7eadeed691c4fd5a2926dfcf58908c98b3230f760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7963 11188 bytes
font_02_sfnt_off00009e1a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1A 4324 bytes

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