Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a996d413861aa9…

MALICIOUS

PDF

45.7 KB Created: 2020-09-03 00:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb7f6dee79538a7e45eab8ebda8bed38 SHA-1: 377d53cdcf143d7ab8020748c0e90c4d84ee583d SHA-256: b0a996d413861aa90f1272118a3701694f9c2e6be79bd8dc5a2ff6a94bfda624
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=dosis+cefadroxil+anak+pdf, which is likely intended to lead the user to malicious content. The presence of numerous other PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute the malicious URL.

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/wix?keyword=dosis+cefadroxil+anak+pdf
    • https://static.usrfiles.com/ugd/a2d007_376fc64ba09b4ff2b7b47b506858ed51.pdf
    • https://static.usrfiles.com/ugd/b444d4_200b828650cb41e5ab0f61d6b9d604b2.pdf
    • https://static.usrfiles.com/ugd/1b7c00_d58ce57779574a7497d7ab00dbcc0e8c.pdf
    • https://static.usrfiles.com/ugd/8c0e65_59b3ca1cadd94b8598b6828997a138d0.pdf
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/80795881400.pdf
    • https://cdn.shopify.com/s/files/1/0430/8015/5290/files/74496871539.pdf
    • https://cdn.shopify.com/s/files/1/0428/8810/2051/files/advertising_discord_servers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/little_house_in_the_big_woods_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/bebidas_isotonicas_hipertonicas_e_hipotonicas.pdf
    • https://cdn.shopify.com/s/files/1/0432/4461/7885/files/pejageluwipedi.pdf
    • https://cdn.shopify.com/s/files/1/0445/8142/1215/files/electronic_structure_of_atoms_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7141/files/customer_satisfaction_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0432/2371/1903/files/nisosiveletejobo.pdf
    • https://cdn.shopify.com/s/files/1/0448/2557/5581/files/being_there.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000686a.bin
4700071711571197d99afd97c49a498f0e883a0a7d373e1cd4979cf553ceed1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686A 4988 bytes
font_01_sfnt_off00007968.bin
1f16172371873dff66a15a0f9589f12faea5deae7c3c27c50dd16b316773d770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7968 10228 bytes
font_02_sfnt_off00009c0b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0B 4324 bytes

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