Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c837d80f4b8dd6…

MALICIOUS

PDF

39.0 KB Created: 2020-08-30 14:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f72dc7f67142fb4991c4a077e73bd1f4 SHA-1: aa31dde16ca30a5b49abdb296a2c5688029c8318 SHA-256: c1c837d80f4b8dd6f2356a10afb38ace7cfe424e723f79bf852a8ab7acbb9373
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'https://ttraff.com/wix?keyword=used+manual+lathes+for+sale+houston'. The document also exhibits characteristics of a PDF link farm, with 19 external PDF links, many pointing to Shopify domains. The primary attack pattern appears to be directing users to potentially harmful external sites.

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/wix?keyword=used+manual+lathes+for+sale+houston
    • https://static.usrfiles.com/ugd/b8c837_de81def0044f4711a94fb8dd501c1da2.pdf
    • https://static.usrfiles.com/ugd/2813e2_1e309f7d78be4c15acc1a0b75c93a564.pdf
    • https://static.usrfiles.com/ugd/cd79e3_f5351d4204344be6a7778969dc2ba5a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad7b87c34173424db2df9a5e7793df3b.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/93300134765.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/amber_white_noise.pdf
    • https://cdn.shopify.com/s/files/1/0432/0981/8272/files/81944625114.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/current_affairscloud_static_gk.pdf
    • https://cdn.shopify.com/s/files/1/0435/8517/5713/files/les_fleurs_du_mal_resume.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/28815689975.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2667/files/maduwefexofavazeda.pdf
    • https://cdn.shopify.com/s/files/1/0449/2309/3147/files/arteriovenous_malformation_brain_hereditary.pdf
    • https://cdn.shopify.com/s/files/1/0460/3717/2383/files/cube_template_printable.pdf
    • https://cdn.shopify.com/s/files/1/0434/7291/2549/files/15901896845.pdf
    • https://cdn.shopify.com/s/files/1/0434/3532/7653/files/84879156017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0439/7151/0430/files/81349293320.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2654/files/flow_cytometry_protocols_hawley.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2386/files/38988835137.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_off00005ac9.bin
5ed6d879b8e6eb431abf1e6f1edd9586c6d6fe98026d9530cf4d6e01605c2a62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC9 5140 bytes
font_01_sfnt_off00006c0e.bin
badd23d0b98a531cad7603f3a242d824f12318747b17f176d1f5e86c618ad8c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0E 10008 bytes

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