Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f418e37849062d2…

MALICIOUS

PDF

34.3 KB Created: 2020-08-27 16:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8980dded0df2733d281752ddc8b46f4 SHA-1: c7e0c75f085465d90a5c3a246a0e5e6269d4220c SHA-256: 7f418e37849062d28cb82c922e96b6d2b22bf40d2f7d3e29e3d043333022e861
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=blueprint+reading+for+welders+9th+edition+unit+2+answers', is designed to lure users into clicking it under the guise of a document title. The PDF also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt. No scripts were extracted from this sample.

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.cc/pify?keyword=blueprint+reading+for+welders+9th+edition+unit+2+answers
    • http://files.wellnessthroughthearts.com/uploads/1/3/0/7/130775219/ketedaxoloputux_vaxirewid_debivamares_wikeded.pdf
    • http://winumig.kevinchant.com/uploads/1/3/1/6/131637136/mokezasowolufewiwa.pdf
    • http://files.camrapenn.org/uploads/1/3/0/7/130775583/437717.pdf
    • http://raxuxepas.lastwatchhorology.com/uploads/1/3/2/6/132681670/a7991b74bb0b.pdf
    • https://cdn.shopify.com/s/files/1/0440/8259/3957/files/alternative_dispute_resolution_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0428/3269/1367/files/82490224751.pdf
    • https://cdn.shopify.com/s/files/1/0433/9050/1020/files/acid_rain_notes.pdf
    • https://cdn.shopify.com/s/files/1/0448/3887/9392/files/4267991703.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/spectra_s1_breast_pump_instruction_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/28501888824.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/free_pumpkin_acrostic_poem_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/xadobukuvorere.pdf
    • https://cdn.shopify.com/s/files/1/0438/6455/5680/files/anaesthesia_for_awake_craniotomy.pdf
    • https://cdn.shopify.com/s/files/1/0431/0273/2448/files/cefr_grammar_levels.pdf
    • https://cdn.shopify.com/s/files/1/0436/0483/6515/files/bakaiti_video_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0435/3936/6047/files/25634922664.pdf
    • https://cdn.shopify.com/s/files/1/0427/7751/0055/files/fuguterovukorelu.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_off00004729.bin
324b746573d9a1260f3122dd611fd65bd75b8427fa10a590870a85e85041a372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4729 5732 bytes
font_01_sfnt_off00005ac2.bin
e850d957113ed287c0e51499a84b737c1ebf89f022941acef85c539b34a292bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC2 9780 bytes

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