Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91ff5439e5d74a7…

MALICIOUS

PDF

51.7 KB Created: 2020-08-18 13:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb8f11ba1a1f41f888737e9e19fdbbb8 SHA-1: 039910b9b18d235632ff23b70284b457f19e4496 SHA-256: e91ff5439e5d74a7f9cd5228575c6c404a8f2a37ff1a160397d56d6a29ffa84e
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or malware distribution attempt. The document body mentions 'score hero hack version ios', reinforcing the lure. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=score+hero+hack+version+ios
    • http://files.moreheadtheatre.org/uploads/1/3/2/6/132681342/2ab6a3cc2.pdf
    • http://puwuxid.zsystemsorder.com/uploads/1/3/1/4/131452883/galulupejarukemusof.pdf
    • http://files.nathalielacoste.com/uploads/1/3/2/6/132695805/3935982.pdf
    • http://files.bridgerbirthing.com/uploads/1/3/2/7/132740250/jofivesometezad.pdf
    • http://rulamip.indianlandsocceracademy.com/uploads/1/3/2/8/132814930/rigusifagomo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/12392972245.pdf
    • https://cdn.shopify.com/s/files/1/0437/3607/2341/files/38920907835.pdf
    • https://cdn.shopify.com/s/files/1/0434/3277/1734/files/bizhub_c258_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/52588587551.pdf
    • https://cdn.shopify.com/s/files/1/0439/1292/1256/files/bidajuwiriwedemunevulaxim.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3605/files/25668394995.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6787/files/18708625703.pdf
    • https://cdn.shopify.com/s/files/1/0433/0618/8955/files/vmware_workstation_pro_15.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/nesera.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2821/files/93087323286.pdf
    • https://cdn.shopify.com/s/files/1/0430/9126/3649/files/problem_based_learning_an_approach_to_medical_education.pdf
    • https://cdn.shopify.com/s/files/1/0434/8893/6102/files/71789321250.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1218/files/74527513758.pdf
    • https://cdn.shopify.com/s/files/1/0428/5395/7799/files/95268483091.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000699c.bin
6f057db86ab47337638effbab4ee9a8d7dd2b6e7fd0a7373219fa4d0402e2672		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699C 3324 bytes
font_01_sfnt_off0000759f.bin
ffa8133adfc2dae2b0bca63b052fb132f32278d1ca43a98b62932346a1315ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x759F 5080 bytes
font_02_sfnt_off000086d8.bin
89f0cdc0ab85a193680b128c9dc0e7e4e17a4b85a762b074b04e42d9ee378e53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D8 10192 bytes
font_03_sfnt_off0000a9f0.bin
1af5c9776e01a59ab532b9c220cf2e075bc4dfded9377588c8e2b315bab9e07a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F0 16544 bytes

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