Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d540d488ce2b85…

MALICIOUS

PDF

39.1 KB Created: 2020-08-31 09:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37d964d46667823cbf9c7bfee72f556a SHA-1: 24105f0afba827bf7d2033d9515e789a17650686 SHA-256: d7d540d488ce2b85865c7fa04d4eefd124247132a3cedf86bf6e2cacd7868fba
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains the same URL and references 'topographic map profile practice packet answers', suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify. The primary malicious IOC is the redirector URL.

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.club/wix?keyword=topographic+map+profile+practice+packet+answers
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/33463059947.pdf
    • https://cdn.shopify.com/s/files/1/0462/3302/6709/files/renetasik.pdf
    • https://cdn.shopify.com/s/files/1/0432/9930/7678/files/physiology_of_muscle_growth.pdf
    • https://static.usrfiles.com/ugd/37428b_c546012415e64f5f8580bb9d1807e15e.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5923/files/jepemapegapitib.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/40k_adeptus_custodes_codex.pdf
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/honda_civic_2020_manual_uk.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/32391443862.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/assembler_plusieurs_en_un_seul_document.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/97686784840.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_off00005b57.bin
a63f3bf4d13851c11e3d39197044ea5fce5bd48cdae6886bf1d82193b5df590b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B57 5536 bytes
font_01_sfnt_off00006e1a.bin
91677ba039f5457a217178ce1d95cead9e44bf00ba55baa28bc2178f82e95da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1A 9752 bytes

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