Malicious PDF — malware analysis report

Static analysis result for SHA-256 692725fa49391609…

MALICIOUS

PDF

49.2 KB Created: 2020-07-29 18:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 943ac57a7e2703c188e210917be3c362 SHA-1: b725b1a07182a7dd1a6362a78407bcb094390cb1 SHA-256: 692725fa4939160938d26a915f9f650cf3dff5dc47875f0816ada88782aeaddb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a link farm or SEO poisoning attack. The document body, though heavily obfuscated, appears to be a lure related to 'genetic algorithm matlab code for optimization'. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs supports the redirection attempt.

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=genetic+algorithm+matlab+code+for+optimization+pdf
    • http://files.allisonwiserpianist.com/uploads/1/3/0/7/130776755/6547324.pdf
    • http://files.porthuronea.org/uploads/1/3/1/3/131379904/4666292.pdf
    • http://files.ceso.on.ca/uploads/1/3/1/8/131871571/runuxapi.pdf
    • http://files.lunalaila.com/uploads/1/3/0/8/130813409/sawanalodakegutup.pdf
    • http://files.gentlemencallers.com/uploads/1/3/1/4/131453522/7285900.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/xanuvojifugikezuvizifo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4925/4041/files/63925455289.pdf
    • https://cdn.shopify.com/s/files/1/0430/3545/9738/files/71336842235.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/fowevox.pdf
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/vikobawoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/pudawekimewexetifudu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3668/0102/files/sibuzeguw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/witowizuxos.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/velamumosalotinosupaxolu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/telivugatepikusa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/94203982811.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/81624635265.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/wewim.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/regofejizor.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078d0.bin
d368ffe51fe385d8a127d205e82d5ea9bf6c2afb0ec8fa2a301859d485ec954d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D0 5400 bytes
font_01_sfnt_off00008b04.bin
fc2211703fbfa36d6772010c46884fae6471f61faea2d68fb279ae6f0b268cb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B04 13844 bytes

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