Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64aceaf0823bafe…

MALICIOUS

PDF

45.4 KB Created: 2020-08-11 00:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da40d3fbd5b6649558693b6b21dab284 SHA-1: 4137e10c3e4bb6e66901a5dc2b76e1a3df1bc143 SHA-256: f64aceaf0823bafe2234a4e299ea690be7aae8f87ab80085f97b611a9689c4d4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=bacterial+gastroenteritis+symptoms+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=bacterial+gastroenteritis+symptoms+pdf
    • http://fojawipi.paultraviscrybaby.com/uploads/1/3/2/7/132712615/425155b.pdf
    • http://files.mixedplatecatering.com/uploads/1/3/0/8/130814124/5743805.pdf
    • http://files.doaneyip.com/uploads/1/3/0/7/130776363/3705562.pdf
    • http://rileg.heraldinghistruthministries.com/uploads/1/3/2/3/132302782/5de8c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/66054545538.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/osrs_black_demons_slayer.pdf
    • https://cdn.shopify.com/s/files/1/0431/6351/7092/files/wanuvajegug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/47711656088.pdf
    • https://cdn.shopify.com/s/files/1/0434/5344/8358/files/57159129764.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/71335632323.pdf
    • https://cdn.shopify.com/s/files/1/0431/2694/7989/files/pilates_para_hernia_de_disco_lombar.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/38070690620.pdf
    • https://cdn.shopify.com/s/files/1/0439/4024/9755/files/adrienne_letesha_marrow.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/21549034366.pdf
    • https://cdn.shopify.com/s/files/1/0428/3010/2694/files/emotions_faces_chart.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_off000073fb.bin
0d0d349ced07c2ba39bd3d8fee015b5271c9742a3039b13be531463d1230ed93
pdf-font-stream PDF embedded font (sfnt) at offset 0x73FB 5624 bytes
font_01_sfnt_off0000870a.bin
b0b98f47268bb1d3b337bfa939a6bb2e83cb96ae1b5dea1697f3c13d1a051dad
pdf-font-stream PDF embedded font (sfnt) at offset 0x870A 9884 bytes