Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef981258b08db66…

MALICIOUS

PDF

41.4 KB Created: 2020-08-19 16:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37ddb562f1e42a2348b94c1d5c27a66d SHA-1: 57048b77dbed17903e804aca800e180d5daf76af SHA-256: 9ef981258b08db66c3a27650ac76a1a827c93f21b29d49471559b27719ee2e5d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a specific redirector URL, indicating a phishing or scam attempt. The primary malicious link identified is https://ttraff.ru/pify?keyword=chat+application+in+android+using+firebase+github, which is designed to lure users into clicking through to potentially harmful content. 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=chat+application+in+android+using+firebase+github
    • http://xopeta.emateria.com/uploads/1/3/1/4/131453045/2a2352.pdf
    • http://zaseloxab.isladventures.com/uploads/1/3/0/8/130813988/4a69d.pdf
    • http://lixaxur.quantumenergetichealings.com/uploads/1/3/1/4/131452903/gifitorawikofufo.pdf
    • http://jatexuz.atlchester.com/uploads/1/3/1/4/131406592/978fe5.pdf
    • http://files.theplatinumbutton.com/uploads/1/3/2/7/132740982/94949d9a.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6952/files/49185299969.pdf
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/all_prefixes_and_suffixes_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/wojijet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/66936372231.pdf
    • https://cdn.shopify.com/s/files/1/0440/1784/4382/files/jenivibotibir.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/nubamezujijixupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9721/8458/files/68123186360.pdf
    • https://cdn.shopify.com/s/files/1/0428/4658/4999/files/gewopusunuketibasos.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/20727616668.pdf
    • https://cdn.shopify.com/s/files/1/0434/5020/4327/files/kajefewekolisuse.pdf
    • https://cdn.shopify.com/s/files/1/0435/1141/4939/files/78341336658.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/pan_fried_pork_chops_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0436/9560/3865/files/estados_financieros_de_bimbo_2020.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_off000062c6.bin
11c7ae8daeec14f0f42bf86bc05825528c1fa3466a58b3d4ebfa5ef208ce1eb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C6 5464 bytes
font_01_sfnt_off0000753f.bin
8c8483410cb04b4f7050047c20f527085c00c515c7b5dc8454722d4571fd292d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753F 10232 bytes

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