Malicious PDF — malware analysis report

Static analysis result for SHA-256 21afd19ffd66f20a…

MALICIOUS

PDF

40.8 KB Created: 2020-08-04 04:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfc000c117a2ba64119dfe70deb1783e SHA-1: 62f0d5b322c615ffc6da97d16d97c37db3fbcc31 SHA-256: 21afd19ffd66f20ad88e5b98ce9cf4858b8aa47726edebd4b4de22b23f4cbfff
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristic analysis indicates it's part of a link farm. The primary malicious URL is https://ttraff.ru/pify?keyword=arvore+genealogica+em+ingles+pdf, which likely serves as a lure to a phishing or malware site.

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=arvore+genealogica+em+ingles+pdf
    • http://files.sheffieldflute.co.uk/uploads/1/3/1/8/131871572/5644957.pdf
    • http://files.thomasoudman.com/uploads/1/3/0/9/130969508/lumirulana_sewat_bapubobix_lexusopili.pdf
    • http://dutejox.nonprofitjourney.org/uploads/1/3/1/6/131637136/2353304.pdf
    • http://files.scharencycles.com/uploads/1/3/0/7/130776118/ginukaxezunat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/nopekaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/35385383528.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/94360950879.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/biocatalysis_in_green_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/importance_of_learning_by_doing.pdf
    • https://cdn.shopify.com/s/files/1/0435/3415/5928/files/vuxezedelovawitipiz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0326/3650/files/mossberg_500_for_sale_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/rukufanit.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/43859691828.pdf
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/bowepasowikutamijev.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_off00006076.bin
3d9f2e00c1227634d737e669092b153d741ba5f86c4d526e62a987f851fa486b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6076 5524 bytes
font_01_sfnt_off00007339.bin
4350fb50488638ae40d60c20698b6927c45c8c42ee4e4e89a3a9a823803c514f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7339 10600 bytes