Malicious PDF — malware analysis report

Static analysis result for SHA-256 4682d95d4679c4a3…

MALICIOUS

PDF

48.3 KB Created: 2020-08-14 03:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fbfe84b26d7b7d7098622ef2f3ea3f6 SHA-1: a68cd0f8e33231da7a05c2076b8ca1ef65c1b0d4 SHA-256: 4682d95d4679c4a3a7cee948b655615086f4f0ea41480b970526cb122ca9c887
152 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.cc, which is likely used to obscure the final malicious destination. The document also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.cc/pify?keyword=stonehenge+tour+guide
    • http://files.squareonegoodsco.com/uploads/1/3/2/8/132815154/tasawaz.pdf
    • http://wived.unswrowing.com.au/uploads/1/3/1/3/131380284/dadifap-sibojesilenu-motukib.pdf
    • http://files.healyshandyhouseholdhints.com/uploads/1/3/1/3/131398176/2136e6a3.pdf
    • http://files.aohkait.com/uploads/1/3/0/9/130969370/zigaxinegoj.pdf
    • http://files.elizabethkpetersonlab.com/uploads/1/3/1/3/131384663/4744178.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/85322058282.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/17121313804.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/marxist_approach_to_industrial_relations.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6981/files/wish_clauses_rewrite_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0438/4794/2304/files/smiley_face_stickers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9462/9786/files/lambda_copy_paste.pdf
    • https://cdn.shopify.com/s/files/1/0452/4458/0002/files/anexos_cutneos.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/41686126425.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1054/files/62301261771.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5208/files/gusozegudepodamat.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/29874142995.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_off000073df.bin
a531662589fcb83666d1bea2c339396ab6ae8818fe02dccdebc50ffa5e0aacbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73DF 4652 bytes
font_01_sfnt_off0000839c.bin
a79e29904adb98326a99ecf75d4085122f93a59026ae9547ca29f916c563c8b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x839C 10304 bytes
font_02_sfnt_off0000a653.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA653 4324 bytes

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