Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6f890007da6071…

MALICIOUS

PDF

42.2 KB Created: 2020-08-10 09:39:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8178ab16f2fdc17409cebb495963424 SHA-1: f7e4647c56a15f36d4c9b029ef23efe3f1505e64 SHA-256: cd6f890007da6071a69eca3fbd8da9e0e61a25592b70c60466de1b9c6d65e991
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially garbled, includes text related to downloading a PDF, suggesting a lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to malicious infrastructure, and PDF_SEO_LINK_FARM indicates a large number of external links, likely for SEO manipulation or to host further malicious content. 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.com/pify?keyword=learning+chinese+characters+from+ms.+zhang+pdf+download
    • http://loxis.buildingfaithwithfun.org/uploads/1/3/0/7/130740522/891468.pdf
    • http://files.melitaharvey.com/uploads/1/3/1/1/131164081/xaxuzizi_xipufuvevezona_zoravojon.pdf
    • http://files.wimbornealliance.com/uploads/1/3/2/6/132695694/f05d4a893.pdf
    • http://files.spadeesperanza.com/uploads/1/3/1/3/131398547/6669510.pdf
    • https://cdn.shopify.com/s/files/1/0437/7634/4225/files/7602435631.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/47373026399.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/xetikudowutuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/65526241451.pdf
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/tomuxixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3697/files/89639957695.pdf
    • https://cdn.shopify.com/s/files/1/0434/4722/2422/files/50666238271.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/60603441204.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5613/files/pinowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6301/files/vejinubixujev.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/wofenepusasosezaxubiru.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_off000058d2.bin
6fe6019a5c3b1b6253d130d8974ef7a0f1021d29d56ffc8f5814ca454ea861cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D2 3496 bytes
font_01_sfnt_off0000654f.bin
8fbd6abee7819705e5b16d2da80bcb7d9fc792b18785f73e19cf8f56a076fb38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654F 5684 bytes
font_02_sfnt_off0000789f.bin
28a581b09e2ea0cb666fe45a876d710f1523a930935e6602b260cb636def399f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x789F 10132 bytes

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