Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18abf3635ac3fa4…

MALICIOUS

PDF

41.1 KB Created: 2020-08-04 17:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34092495e255fa2f6fd0d97efe50a3bf SHA-1: e71a742e75f80f6caf5a57025d8c8081e6f51681 SHA-256: d18abf3635ac3fa4565ce92aa3c92d9665989ba119e923f7c9371024e22686dd
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=aramaic+english+dictionary+pdf'. This indicates an attempt to redirect the user to a malicious site, likely for phishing or malware distribution. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, suggesting an attempt 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.cc/pify?keyword=aramaic+english+dictionary+pdf
    • http://files.joelwapnick.com/uploads/1/3/1/4/131483031/vigaz-dukobugedoni.pdf
    • http://files.leducregioncares.org/uploads/1/3/1/8/131871705/482e3c99.pdf
    • http://files.shesthefirstwisconsin.org/uploads/1/3/1/4/131453560/9122174.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/remove_likes_from_facebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/3554/1151/files/button_styles_bootstrap.pdf
    • https://cdn.shopify.com/s/files/1/0439/5089/9368/files/77138545920.pdf
    • https://cdn.shopify.com/s/files/1/0434/1897/6408/files/49369297176.pdf
    • https://cdn.shopify.com/s/files/1/0433/9272/9246/files/tomafirew.pdf
    • https://cdn.shopify.com/s/files/1/0430/7356/8919/files/felonan.pdf
    • https://cdn.shopify.com/s/files/1/0436/0280/4898/files/33338714226.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/43573674160.pdf
    • https://cdn.shopify.com/s/files/1/0439/6836/4702/files/nelaziwebonozagopij.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/kesirujojedigugajiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/xikikipujis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/jotawetitixa.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_off000053c8.bin
c6eb28f0c9b57e4139880fdf863f6ab4deede3789e377cb24a950ab9ac9f2599		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53C8 3156 bytes
font_01_sfnt_off00005f21.bin
70297bbea7d91d4d3714cb16df0b4ad847b8d563c309376f69e967451d918d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F21 5660 bytes
font_02_sfnt_off00007241.bin
b4a7822caa1ea527f97e3df5508c860720a5e946ed37db305a9fb9f4beca92a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7241 10252 bytes

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