Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18902b14220333b…

MALICIOUS

PDF

36.1 KB Created: 2020-08-09 23:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21163c5101d68d9546d4166783f4e9b4 SHA-1: 2e035a80b2a31ebdc672338613e02d142577c220 SHA-256: b18902b14220333b3892791cb8d12d81367e3d4a41509538a4e136171b693386
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through these links, likely to a phishing site or for malware download. No scripts were extracted, limiting further analysis of specific behaviors.

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.com/pify?keyword=exploring+public+relations+ralph+tench+pdf
    • http://files.mattiacupelli.com/uploads/1/3/2/6/132682802/dokubukenud-wunoxolurujo-tazatomozakum.pdf
    • http://files.peterqb.com/uploads/1/3/0/8/130814749/goduxapizopute_zesewabevak.pdf
    • http://files.coobcoffee.com/uploads/1/3/2/3/132302940/9002182.pdf
    • http://files.bronzedoklahoma.com/uploads/1/3/1/8/131871704/minulogise.pdf
    • http://files.nextlevelphysique.org/uploads/1/3/0/8/130873826/9397865.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/online_book_library.pdf
    • https://cdn.shopify.com/s/files/1/0431/5126/1853/files/29581652176.pdf
    • https://cdn.shopify.com/s/files/1/0430/8634/8450/files/advantech_iot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/95612719970.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/los_angeles_housing_and_community_investment_department.pdf
    • https://cdn.shopify.com/s/files/1/0433/6399/1717/files/97336854209.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/99859310966.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/35299115414.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/zulibalewazafesalawafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/wazevivuvulipekejewibakav.pdf
    • https://cdn.shopify.com/s/files/1/0437/2699/5621/files/merakepapoxojum.pdf
    • https://cdn.shopify.com/s/files/1/0436/8403/6761/files/mimekirex.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_off00004f20.bin
0ba71e88ba54fe551423fe1ed02d54288d980e8b6d8fdab95f44b8f9f4791c70
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F20 5584 bytes
font_01_sfnt_off00006215.bin
79f641876512bf93ac16d03d0960a68c64997d0d85946e6daab16be82f86d12d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6215 9868 bytes