Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1979f94d2df0b8…

MALICIOUS

PDF

39.1 KB Created: 2020-08-14 11:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec4e8078b46c7a1ced470d22791c45df SHA-1: 301c01fe4f526f249c7fc900e3679fc09dca7f2e SHA-256: ca1979f94d2df0b8f91db58b5aa1da589c435755836d75ae662f034fceba73f6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a debriefing form template. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary malicious activity appears to be the redirection to 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.com/pify?keyword=debriefing+form+template
    • http://files.mikebernalmedia.com/uploads/1/3/1/4/131408256/faa484a.pdf
    • http://silibo.birthandpostpartum.com/uploads/1/3/1/4/131408899/d4a8814d1d57bf6.pdf
    • http://files.callahans.blog/uploads/1/3/1/1/131164112/bizevinurufi-zeviminewofe-soborudakelu-zoliga.pdf
    • http://poravan.vanillabeanonline.com/uploads/1/3/0/7/130740514/lujugisanitixif_dorafavebenosuk.pdf
    • http://files.destinationdancesb.com/uploads/1/3/1/4/131453823/ribizozom_marekedukatenuj_dujeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6308/2146/files/36610105481.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/wawenakovofakeba.pdf
    • https://cdn.shopify.com/s/files/1/0435/4100/4439/files/44531658773.pdf
    • https://cdn.shopify.com/s/files/1/0454/9489/4744/files/demedofakunapam.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/widejuxasokamovukagexevu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5126/0823/files/wakumesibodenekapafuxomun.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/larimeritevepinibova.pdf
    • https://cdn.shopify.com/s/files/1/0434/5505/3989/files/bajogutur.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/38499994392.pdf
    • https://cdn.shopify.com/s/files/1/0441/2535/6184/files/borderlands_2_minecraft_area.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/57409504116.pdf
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/rivomixazetuvez.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ce0.bin
7a07a558915d7ef63d6bab8715f87fff058922436fc3ed9852dcccc46d94ed10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE0 5184 bytes
font_01_sfnt_off00006e6a.bin
88cdddbd7928e186db1686e77e4327159037c24fb319810914a0bd9a921cf722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6A 9744 bytes

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