Malicious PDF — malware analysis report

Static analysis result for SHA-256 55373723ae01f8a7…

MALICIOUS

PDF

50.6 KB Created: 2020-08-08 01:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e329f5d1323ee92db2f4d8e214e53842 SHA-1: 4deae30002b62419f5938246d148be69f4566701 SHA-256: 55373723ae01f8a71d6a84d9acd8ecf93a61d13ea7cca74e3ce638a6bc3c3a75
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large external PDF link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic, suggesting the primary purpose is to lure users to external content. The presence of numerous Shopify links points towards a potential SEO abuse or content distribution scheme.

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=quimica+inorganica+pdf+libros+gratis
    • http://files.rebeccaguay.com/uploads/1/3/1/8/131871484/busojis.pdf
    • http://files.gazzbaby.com/uploads/1/3/1/6/131637150/1521935.pdf
    • http://widefa.lolaandco.com.au/uploads/1/3/2/6/132683014/2516722.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/bevojikoferiresibubasujip.pdf
    • https://cdn.shopify.com/s/files/1/0429/0789/3919/files/nujadenudaxumilaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/anatomy_trains_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0954/8188/files/83843042231.pdf
    • https://cdn.shopify.com/s/files/1/0432/1837/0728/files/tozusumexigenefep.pdf
    • https://cdn.shopify.com/s/files/1/0431/4172/6370/files/vixipadobazomuju.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/master_swing_trader.pdf
    • https://cdn.shopify.com/s/files/1/0429/1821/5847/files/how_to_make_a_game_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9393/files/lusorodixafafaja.pdf
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/least_squares_approximation_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/john_deere_265.pdf
    • https://cdn.shopify.com/s/files/1/0430/1167/0179/files/act_ffxiv_overlay_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4312/files/19632727695.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_off000084fd.bin
d4b99a19480cb52fff7d2843524373147749808b4c890d646074432cb38b6cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FD 5676 bytes
font_01_sfnt_off00009827.bin
b8ea7be13881f35e3fadd347e08edcf0fedf676fdd5aad4a1d7f7d61b6024264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9827 11488 bytes

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