Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46a468a143706e6…

MALICIOUS

PDF

37.1 KB Created: 2020-09-07 16:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3c5db03b22446ecbe9b9ed0036bfea2 SHA-1: 2a729ab19a486f6fc96fcb269c0be76aec8d78a0 SHA-256: a46a468a143706e6c65483f36241833691832d88ded07e253b9e4bf0afa5c638
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=achievements.+csv+clash+of+clans'. This URL is presented within the document body, disguised as a link related to 'achievements.csv clash of clans', indicating a social engineering lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to benign Shopify domains, likely used to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=achievements.+csv+clash+of+clans
    • https://static.usrfiles.com/ugd/ba2c19_32233632c46849be9085c71fcd78650e.pdf
    • https://static.usrfiles.com/ugd/96768c_e3abda15a9fd444e825d6429aa931cc6.pdf
    • https://static.usrfiles.com/ugd/d2057d_3b96e1c5b731489b98b6feb5228c4f0e.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8997/files/kappa_womens_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/6304/0408/files/wuvadokob.pdf
    • https://cdn.shopify.com/s/files/1/0463/3863/7981/files/lost_maples_foliage_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/gafuwobeveme.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/13338558950.pdf
    • https://cdn.shopify.com/s/files/1/0428/4553/6419/files/98419554331.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/notting_hill_carnival_route.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/31142103713.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://static.usrfiles.com/ugd/30e015_5540d088452e4b0692ef2205e53f4646.pdf
    • https://static.usrfiles.com/ugd/8da65f_fca838a4b96a48e4abf368d3e717e187.pdf
    • https://static.usrfiles.com/ugd/ea2c45_79ea2e31c88742aeb32354c49da2c24c.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_off00005303.bin
1632f1d3ac1069cbe589eb53cfc5664904f0d1a765b0d17cd5b8e832229d62ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5303 5104 bytes
font_01_sfnt_off0000644f.bin
7a97499b60dd554c78fcbcfd3295e3bc937042a98ff7630ad16326394bda997d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644F 10256 bytes

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