Malicious PDF — malware analysis report

Static analysis result for SHA-256 7939d5fd716e8c44…

MALICIOUS

PDF

40.9 KB Created: 2020-08-02 23:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f944410f6c702d350b411b9db2b64bf SHA-1: a72fa9b235139ca31f5195d2672496af2bc3fee9 SHA-256: 7939d5fd716e8c44517af1fc0832eae52413391c1e1e55c740445a4741a526e2
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains text referencing a Toshiba manual and a URL that further supports the lure. The presence of numerous external PDF links suggests an attempt to create a link farm or distribute malicious content through multiple domains.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=toshiba+dkt2020-+sd+manual
    • http://files.lostcityoftrellech.org/uploads/1/3/1/6/131606349/4494339.pdf
    • http://files.miss-millers-classroom.com/uploads/1/3/1/6/131606393/e06b5587d.pdf
    • http://files.cookiesbykristin.com/uploads/1/3/0/9/130969477/nesubigifatajosid.pdf
    • http://files.candicechristie.co.za/uploads/1/3/0/7/130775347/4740321.pdf
    • http://files.jeffersonumcmd.org/uploads/1/3/1/3/131381919/gisuja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/2785/6536/files/22246429167.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/lil_bomber_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/54456497738.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.pdf
    • https://cdn.shopify.com/s/files/1/0434/4361/7948/files/example_of_negative_punishment.pdf
    • https://cdn.shopify.com/s/files/1/0433/6323/8056/files/wuludikuzira.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/wipoxijixiwimabuxasinena.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/45605830219.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20785775646.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/99725704227.pdf
    • https://cdn.shopify.com/s/files/1/0439/5198/0712/files/89502451185.pdf
    • https://cdn.shopify.com/s/files/1/0431/9582/6336/files/wavuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botezosural.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000552a.bin
be2ba2e7e7744d04ec614e26ecdab960f63d9fe49f0d856caef05fb3e1e812ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x552A 5192 bytes
font_01_sfnt_off000066a6.bin
405477d1dc962e7c43c1e295da3d8efa8f998ab8d8da36aedbab0075613fb8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A6 9948 bytes
font_02_sfnt_off000088ac.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88AC 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.