Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a190ec553e3d7d…

MALICIOUS

PDF

69.1 KB Created: 2020-08-08 08:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de4faa51fce028358606b6f1bf37fa4a SHA-1: bb8e1ea16e86036e6aee3983d9700d27eb1c9f42 SHA-256: 28a190ec553e3d7dfd527c839eb87bc95ed521675ded50d5b597bd0db46ab43f
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 hosted on ttraff.ru. This infrastructure is known to redirect to malicious sites. The document body, though heavily obfuscated, contains the same redirect URL, suggesting a deliberate attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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=husqvarna+automower+435x+awd+bedienungsanleitung+pdf
    • http://files.amanda-g.net/uploads/1/3/1/3/131383541/wapebevomarate_xudusobizabo_gobevo_wamitugul.pdf
    • http://files.daniel-pratt.com/uploads/1/3/0/8/130813837/zekekakazozaxex_xobamavabixe_nejenep_tisadofij.pdf
    • http://files.veronicamay.co.nz/uploads/1/3/1/4/131437225/jiwegoz.pdf
    • http://files.berelaxedmn.com/uploads/1/3/2/6/132682022/futonizipasexo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/ublock_origin_blocking_videos.pdf
    • https://cdn.shopify.com/s/files/1/0428/4694/5436/files/59192081807.pdf
    • https://cdn.shopify.com/s/files/1/0444/4412/3303/files/digestive_system_function.pdf
    • https://cdn.shopify.com/s/files/1/0432/0860/5859/files/dumodugodewesipopi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/sadiku_elements_of_electromagnetics.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/46039868725.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/44229604387.pdf
    • https://cdn.shopify.com/s/files/1/0439/6243/3694/files/xovakabafomosadeperabato.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/pewabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/relumax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fesitoxerevujadutag.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_off0000c0e9.bin
d669be51162dfce0e4a357be66b2c29d668f66896545d769fafc29303bb6fd51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E9 6068 bytes
font_01_sfnt_off0000d584.bin
2c7f1d05189261ac4b30c19990d7384b1e525f51c02deda392b7331e3b475cb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 10196 bytes
font_02_sfnt_off0000f86a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 4324 bytes

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