Malicious PDF — malware analysis report

Static analysis result for SHA-256 132efdbb4971776c…

MALICIOUS

PDF

42.5 KB Created: 2020-08-14 21:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2021cdb8a5cf3ff3750fa06d12d57f8 SHA-1: 09fd25e9d0daeb84e327ab1864b0c79da35d8e67 SHA-256: 132efdbb4971776c4ba87913f2aee0c133fae4ae41a842204377a8a975526c74
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=administrator+job+description+template, suggesting a lure for job seekers. The PDF also hosts a link farm of other PDFs, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier strongly supports the malicious verdict.

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=administrator+job+description+template
    • http://files.damselflyyogaspa.com/uploads/1/3/1/8/131871980/417455c1b959a9d.pdf
    • http://xejodiful.burienlittleassembly.org/uploads/1/3/0/9/130969813/4581235.pdf
    • http://files.love4picnic.com/uploads/1/3/1/3/131398129/xiwosiw.pdf
    • http://files.schrockhampshires.com/uploads/1/3/1/4/131409442/pufepazes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3980/7893/files/luxeworobenimi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/pajedipubifu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/2020_buick_regal_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8049/files/xitazosudivi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/51765816039.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/bebokefuna.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/valilipepa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4997/5961/files/tejakofuborasarareku.pdf
    • https://cdn.shopify.com/s/files/1/0433/1244/7652/files/metodos_anticonceptivos_definitivos.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_off000061e4.bin
0a7dfe716bf3e410a761e764ed2e2a528281a0776f19d69b6ad79f85628b2ecf
pdf-font-stream PDF embedded font (sfnt) at offset 0x61E4 5424 bytes
font_01_sfnt_off00007431.bin
d780fc735ac7a21fd51fbd717be06ced705a071a800be8c50638f946ac638a9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7431 13028 bytes