Malicious PDF — malware analysis report

Static analysis result for SHA-256 623fdabcc3cedbb9…

MALICIOUS

PDF

45.4 KB Created: 2020-11-02 19:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0aa76a04f4bbb97f1f67919de9143ac SHA-1: 1254bd9d544fc21e6d0db10d6e5b3158e138e4c2 SHA-256: 623fdabcc3cedbb93e41437c39953a60089a56c43ca4f6d0e4244c1878d817ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and a deceptive title suggesting financial gain, which is a common lure. The presence of numerous external PDF links, some pointing to potentially malicious or SEO-farmed content, further supports a malicious intent to redirect users to harmful sites.

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.ru/123?keyword=1+million+dollars+value+today+vs+2040
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f8ec42d6a3b7.pdf
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5f8fdcf578089.pdf
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f913a804e187.pdf
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f8926be400b4.pdf
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5f95ccebd5cd4.pdf
    • https://cdn-cms.f-static.net/uploads/4416669/normal_5f9a2e65e814e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xukonakefules/jewodovem.pdf
    • https://s3.amazonaws.com/wibedubosateg/pictionary_cards_easy.pdf
    • https://s3.amazonaws.com/xukonakefules/nanidaruvatekilidin.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/zuripan.pdf
    • https://s3.amazonaws.com/takateg/asphalt_8_mod_apk_free_download_unlimited_money_and_tokens.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4773/files/todetenubuwamavuzasitim.pdf
    • https://s3.amazonaws.com/kabisebax/jesatawolemetijatokadivaz.pdf
    • https://s3.amazonaws.com/tapexiw/giant_lenny_face.pdf
    • https://s3.amazonaws.com/rodigapigeta/vuwoxi.pdf
    • https://cdn.shopify.com/s/files/1/0507/4219/8467/files/tivunatoletebizeluko.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_off000065db.bin
65998a07422a8b68664892b96781a840386eb4f0ac31760f23b8977747f9a15b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DB 5336 bytes
font_01_sfnt_off000077ed.bin
a53ec5b655025ffa5978d48f3a81831a4f8678bca2da32e5ab5ffc338c2a9d01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77ED 10184 bytes
font_02_sfnt_off00009ab1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB1 4324 bytes

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