Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c617e86b8ab46ab…

MALICIOUS

PDF

50.8 KB Created: 2020-08-30 12:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 382520140a2539e18ed9744da3bec692 SHA-1: 76191a2c2533f339312ab521b04935478f297650 SHA-256: 6c617e86b8ab46ab9926d27b3fc20512e34a5c53d8aa1bf7d0bbaf7f35fecf8d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, disguised as an 'Nvidia driver crashes' notification. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the embedded URL strongly suggest this is a phishing attempt to trick the user into downloading malware. The presence of numerous other links in a 'link farm' pattern further indicates malicious intent, likely for SEO poisoning or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.me/wix?keyword=nvidia+driver+crashes
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_478ef8dea919480d9464e6ab8d2cf77f.pdf
    • https://static.usrfiles.com/ugd/21e6f2_89603a8ff667471b8dd1b36c39943de4.pdf
    • https://static.usrfiles.com/ugd/b8c837_6aa831ffa1ee41eca5ec82483d40b280.pdf
    • https://static.usrfiles.com/ugd/dd4472_95a468d00aa24284885acba7c57018f2.pdf
    • https://static.usrfiles.com/ugd/8a419d_6d4a3ff0c0244253b6cf338a29ec30b7.pdf
    • https://static.usrfiles.com/ugd/97634b_965c9638ffc44a5a86da9b4d5cbb12e7.pdf
    • https://static.usrfiles.com/ugd/c83fdb_2f13d5e4955c4116b6cfde78f6aa4897.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4347/files/42162686303.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/mozozer.pdf
    • https://cdn.shopify.com/s/files/1/0437/6579/2929/files/61102751515.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/salvation_army_valuation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0451/1947/1781/files/authoritarian_theory_of_the_press.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0bad03dd9e14df385d2d34b03e16fb8.pdf
    • https://static.usrfiles.com/ugd/217d68_78f0b56a0480449296dee5baeca05efe.pdf
    • https://static.usrfiles.com/ugd/271e65_e72512c1579a49ac8d4ab08d65215d44.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c3f0db402aa4661add6d593c1d3be1b.pdf
    • https://static.usrfiles.com/ugd/3b47cb_a4456fea974f4921a29796ee56e92366.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000890e.bin
5649bf051fd09af89728e9b7f9f65e34e9e8b8f63809ce0a06fd6bd5d1d0c7c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890E 5024 bytes
font_01_sfnt_off00009a1d.bin
fd39424538859a27ce6c3771c7993ecc0d76b5f4ff7b5fbc4eec195399b5e4fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1D 10592 bytes

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