Malicious PDF — malware analysis report

Static analysis result for SHA-256 99df28c467f95700…

MALICIOUS

PDF

59.1 KB Created: 2020-08-23 22:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9169635b4f03629d71f11ed88a48ffb SHA-1: 74d8c8c63dad23ab0690a9bddc009276f0dfe3a3 SHA-256: 99df28c467f95700d3dd75fa70e875f273aa217127a867645b3932c1d7bbe056
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 with a keyword related to 'old school hip hop'. The PDF also hosts a large number of links to other PDFs, likely for SEO manipulation or to spread malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=old+school+hip+hop
    • http://pudulezuj.graphiclibrary.org/uploads/1/3/1/4/131437318/mevujodufilew_sefevuno_bosubunulun.pdf
    • http://files.bfafairfaxbaseball.org/uploads/1/3/1/8/131856352/powipobukufosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/nazanusoxufa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/sejudogawugikisuruf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/45673760611.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/zomapegezakewonurewuvubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/mejojovepobunafefepaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/2176/2723/files/abbreviation_worksheet_for_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/jean_ziegler_libros.pdf
    • https://cdn.shopify.com/s/files/1/0428/4379/9719/files/fonts_for_discord.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57515970725.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_off0000abc4.bin
93e5b53e5257e45b363498368613be1f79395302e0830de60931b6dd2a4d7eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABC4 4884 bytes
font_01_sfnt_off0000bc5a.bin
028c934069c924e765259622d2e2c25cc53048b2dd49c5ac1998c9bdf6527c15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5A 10336 bytes

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