Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08cf28a59d63b88…

MALICIOUS

PDF

66.8 KB Created: 2020-08-09 12:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bb3457c21a57a576dc000d6204da3a5 SHA-1: 2b5f4e46deb860da6637ad20d7fe0eec1916419e SHA-256: c08cf28a59d63b88821b0c5a4a8bace0505ac10b73c474e376c8ad0ee1c37fa8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=arachidonic+acid+cascade+pdf'. This URL is embedded within the document body, suggesting an attempt to trick the user into visiting a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also 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=arachidonic+acid+cascade+pdf
    • http://files.fureverfashionbyaprilllc.com/uploads/1/3/0/8/130814118/5600020.pdf
    • http://files.jimdykesministries.com/uploads/1/3/2/6/132681556/2892283.pdf
    • http://files.magcon.org/uploads/1/3/1/8/131871593/1391154.pdf
    • https://cdn.shopify.com/s/files/1/0440/9946/9464/files/38304933074.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/tofevelekugusufekexuwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6881/6544/files/38490550704.pdf
    • https://cdn.shopify.com/s/files/1/0447/3936/2970/files/catalogo_bujias_ngk_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0430/6078/9409/files/mergers_and_acquisitions_as_a_growth_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1671/files/4493758730.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/math_in_the_modern_world.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/lasifakopogopiwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4243/8310/files/62283011865.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4495/files/kakagogisapoxiwajexopoki.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/ncc_admission_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/chess_opening_queen_s_gambit.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/jirizaxipikuziletine.pdf
    • https://cdn.shopify.com/s/files/1/0434/7471/4784/files/fokazafusibopabumix.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_off0000bc8c.bin
e715acb7267c03f480b9cc882570827611b6e1507367b4f238031ef8a61629cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8C 5200 bytes
font_01_sfnt_off0000ce37.bin
8d0e539850a2d345f379ecb77845e5b0fe124f01f247a02c40eaa19fc259ad76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 15316 bytes

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