Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e772cf6395f87e…

MALICIOUS

PDF

41.0 KB Created: 2020-08-15 05:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e437454b0083ee18b0020c37f6ca1c6a SHA-1: 651ee7f4030ee3b8251a7710b7c956bc054763a3 SHA-256: c9e772cf6395f87e2df8fd35501639d38a6c0a7a8af1ca9e493db390919db24b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'wallpapers for android' and the malicious URL itself. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to shopify.com, likely for SEO manipulation to mask the malicious redirector.

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/pify?keyword=black+and+blue+wallpapers+for+android
    • http://xubafa.mountainblueharmony.com/uploads/1/3/1/4/131438416/towimolifone-fanikosedu.pdf
    • http://dojab.my-trans-life.com/uploads/1/3/1/3/131379578/zapididobatubis.pdf
    • https://cdn.shopify.com/s/files/1/0431/9998/7873/files/questoes_de_analise_combinatoria_e_probabilidade.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/bejarifudonasut.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/wexelavivibititogujetebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/meaning_of_tax_administration.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/supply_chain_management_project_for_mba.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1731/files/66529015578.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/xuxor.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/24621527585.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0693/files/pafibitoro.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0931/files/lapiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/gabugi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/tchaikovsky_the_seasons.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_off000062bd.bin
96e5f1a2ed4c3f35df90a0bc024ffeb58f66d662ec69b8d1d46d7d8a11c77899
pdf-font-stream PDF embedded font (sfnt) at offset 0x62BD 5492 bytes
font_01_sfnt_off00007583.bin
f71c615ecb36e1f835717050b5e479c45ac6f075a64cddf2bcf5d66105501004
pdf-font-stream PDF embedded font (sfnt) at offset 0x7583 9848 bytes