Malicious PDF — malware analysis report

Static analysis result for SHA-256 8043100b7f7f641f…

MALICIOUS

PDF

45.0 KB Created: 2020-08-05 02:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e327ea123a2ebdef941c1b6712901fec SHA-1: 0aee5edbcf2c319f8699c7e9f1037ec8013d9b42 SHA-256: 8043100b7f7f641ff5c43fb1b55f92bd3d888f22d84f4c1454151a99b1789d33
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a critical heuristic indicating it contains links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links pointing to various PDF files. The primary malicious URL identified is https://ttraff.com/pify?keyword=journal+psoriasis+vulgaris+pdf, which likely serves as a gateway to further malicious content. The document body itself is heavily obfuscated and contains embedded URLs, reinforcing the malicious intent.

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.com/pify?keyword=journal+psoriasis+vulgaris+pdf
    • http://files.identitycrisisundone.org/uploads/1/3/1/8/131872149/rasoloma.pdf
    • http://files.southcoastlife.org/uploads/1/3/2/7/132711947/lojaga_takegafeduxopeg_gimemawamigis.pdf
    • http://files.kccpllc.com/uploads/1/3/2/7/132740435/25fb50e87e17d.pdf
    • http://zoxirira.erikasteeves.com/uploads/1/3/2/6/132681947/6031964.pdf
    • https://cdn.shopify.com/s/files/1/0434/2130/2935/files/guremoduz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7719/7221/files/81740272087.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0743/files/52975359313.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7602/4475/files/93282285018.pdf
    • https://cdn.shopify.com/s/files/1/0440/6706/1925/files/darexasewenupupuwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78992801071.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1781/files/14837747727.pdf
    • https://cdn.shopify.com/s/files/1/0432/7309/3288/files/63578384940.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/adobe_after_effects_full_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/rovizexumafokojagus.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/
    • https://cdn.shopify.com/s

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007269.bin
63b497e496b1b9068ef916477bbd7873b26167ea2be21da8471c78faee4ccce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7269 5256 bytes
font_01_sfnt_off00008466.bin
d7dd5cf53cb130ff12fbad924603645d3a0a5b672f715773635c2e3fd416f782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8466 10040 bytes

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