Malicious PDF — malware analysis report

Static analysis result for SHA-256 665140ffd8c6562a…

MALICIOUS

PDF

41.9 KB Created: 2020-07-18 04:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f155fdbe084cc85c1594dfde6946dcdc SHA-1: e3a7bae40483e4c013aa7dc1fbf1330ed928777f SHA-256: 665140ffd8c6562ae1750d900c2c781c13d0f940fbb164a93dcc32730c392fea
154 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its inclusion of a large number of external links, characteristic of an SEO link farm. The primary link, 'https://ttraff.ru/wb?keyword=persuasion%20pdf%20free%20download', suggests a lure for users seeking free PDF downloads, which redirects to potentially harmful content. The ML classifier strongly supports the malicious verdict, indicating a high likelihood of malicious intent.

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/wb?keyword=persuasion%20pdf%20free%20download
    • http://files.greekdressing.net/uploads/1/3/1/3/131380120/tasuxen.pdf
    • http://files.gilbertparksandrecreationfoundation.org/uploads/1/3/2/7/132740458/jenax.pdf
    • http://files.humanesocietyofdelnorte.org/uploads/1/3/1/1/131163705/lubonipoxeguxifavel.pdf
    • http://files.lemonpatches.com/uploads/1/3/0/8/130813362/temavuzugotasepu.pdf
    • http://files.fulltiltstreetrods.com/uploads/1/3/0/7/130739712/nebolobozis_povimifopodolet_penexoro.pdf
    • http://files.redtrustbushey.org/uploads/1/3/1/6/131637307/zosakojofutom-gozobosukowemi-joruparod.pdf
    • http://files.joannapickering.com/uploads/1/3/1/6/131606431/fetexejaliku_bupel_netoledukomek.pdf
    • http://files.shenfieldlearning.com/uploads/1/3/1/1/131164567/ae3cbc5a8a34cb8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bapomen475531298.files.wordpress.com/2020/06/vizinipoludowodok.pdf
    • https://fiwogomajalo.files.wordpress.com/2020/06/98885462694.pdf
    • https://sunadasuz.files.wordpress.com/2020/06/kufawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/16323641331.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6059/files/39908161694.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/56700871984.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/furodusekuwexipudawixar.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/32191476698.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59577082877.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/jibodibogalalosexoxevun.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_off0000674e.bin
7d2628a72e05d40a4a3953c5fb3f4b4937ec21522bb12376cfa89942a7becbfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674E 4932 bytes
font_01_sfnt_off00007827.bin
330b39d2b3415d308c92e90fc38f8d76c7895c9a92afe8b87d061652a93f1e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7827 10008 bytes

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