Malicious PDF — malware analysis report

Static analysis result for SHA-256 46852eccf8dc2ac9…

MALICIOUS

PDF

35.5 KB Created: 2020-08-14 08:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd275d0e68fcd7affca61cd8ef2ae2f8 SHA-1: 03e6396ce2410ef27e02c853d5c40ad9603c9f07 SHA-256: 46852eccf8dc2ac9c550be48147b91268bcb944d9388ba8a0de071037c128ccd
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though heavily obfuscated, contains the URL that triggers the redirector. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing and the ML classifier's high confidence score indicate a malicious intent to redirect the user to harmful content. The file also contains a PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or distribute malicious links.

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=cine+filmes+v2+android
    • http://nofex.cindybrandner.com/uploads/1/3/0/8/130874250/484683.pdf
    • http://files.advanceddentalimplantstudies.com/uploads/1/3/1/1/131164479/75457db2ac3a2e.pdf
    • http://zanix.ellensdolls.com/uploads/1/3/2/6/132696323/nikovologuvezuk-wokunuzu-gegixuf-vapew.pdf
    • https://cdn.shopify.com/s/files/1/0431/6269/7894/files/administracion_de_pequeas_empresas_longenecker_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/3758/8646/files/autodesk_3ds_max_tutorials_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/gitedavukawiwimozozozexam.pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/shadowmaw_panther_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0446/1517/2259/files/2527320423.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/learn_css.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2708/files/jewufegabovugufeni.pdf
    • https://cdn.shopify.com/s/files/1/0436/2433/3472/files/rainbow_lens_flare.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/appointment_letter_format_for_teacher.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/noredesirisiwuzominiged.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31184917419.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/giruvifudojok.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d90.bin
8e39db8673a800a2c9d6953fb637ef93808de0055c957e15051a8894e4010eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D90 5152 bytes
font_01_sfnt_off00005efd.bin
d5715ab4d589aabd26127319d880664a845b272f9ee57519ed089be61e847ef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFD 10060 bytes

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