Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5646fe08241f2d…

MALICIOUS

PDF

81.3 KB Created: 2020-08-09 21:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18ee102931d19aa711f576bb3bd5a149 SHA-1: 8a63ef95e98e3813f3ba6cb2caecd4e4d5c7bb94 SHA-256: 9f5646fe08241f2d217566af965f7b92f6609e9dbd94eeb91d7717167c9a8399
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the URL that is likely used as a lure. The primary attack vector appears to be a link farm designed to redirect users to malicious 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=what+is+capital+structure+theory+pdf
    • http://files.ecct1868.org/uploads/1/3/1/6/131637402/4666520.pdf
    • http://files.scrantontennisclub.com/uploads/1/3/0/7/130775413/wukib.pdf
    • http://files.causionscreations.com/uploads/1/3/2/6/132695629/xisaxunomiri-wumidok.pdf
    • http://files.hufftrax.com/uploads/1/3/2/3/132303219/7090598.pdf
    • https://cdn.shopify.com/s/files/1/0430/0963/8553/files/zilusobefirelumixixat.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/wuxinazetirelupisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/furavumef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89832202682.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1044/files/durowoxawexunevalizumimix.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4441/files/historia_de_la_diabetes_tipo_2.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5575/files/movapisovizikudapidofu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/48384578055.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/44831824085.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/zebetumanorefozojob.pdf
    • https://cdn.shopify.com/s/files/1/0432/9799/6960/files/3329504773.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/52230887299.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_off0000f2ea.bin
079265608c7c03b2d98b75230ce8c43dc415f487086aae20ee4123f64eb0f6b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 5136 bytes
font_01_sfnt_off00010486.bin
1956bb22649cbe2b2e8ce2902c46a05218009acaf931c2deae8b8b739dbbdb82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 10912 bytes
font_02_sfnt_off000129c1.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 4324 bytes

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