Malicious PDF — malware analysis report

Static analysis result for SHA-256 7696dff1cebc471c…

MALICIOUS

PDF

42.9 KB Created: 2020-10-05 16:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f140aa7adc31b5e1ad73805dfb18669 SHA-1: 1654d8c91b41b2c62154fd07537fa76c6d674105 SHA-256: 7696dff1cebc471ce38f337f5dc516418fd570e3263850eaa1895831d444f795
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and a known malicious redirector. The primary malicious URL identified is https://cctraff.ru/strik?keyword=ask+and+it+is+given+summary, which is likely used to distribute further malicious content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=ask+and+it+is+given+summary
    • https://site-1038552.mozfiles.com/files/1038552/vinizawejomabafovaxiv.pdf
    • https://site-1037141.mozfiles.com/files/1037141/kowimitawijamezotagozom.pdf
    • https://site-1037187.mozfiles.com/files/1037187/23116245922.pdf
    • https://site-1040100.mozfiles.com/files/1040100/5815955145.pdf
    • https://site-1040145.mozfiles.com/files/1040145/nezepakevokelogobetepupi.pdf
    • http://files.sarahellsing.com/uploads/1/3/1/0/131070258/17bd59e.pdf
    • http://natule.kelseysmarina.com/uploads/1/3/0/7/130738850/demujojakofevejegu.pdf
    • http://files.littleandjuniormissbutler.org/uploads/1/3/2/7/132740511/c8d55f.pdf
    • http://files.kkpaquette.com/uploads/1/3/1/8/131857419/b0a79c281602771.pdf
    • http://files.kittyvera.com/uploads/1/3/2/3/132303041/a71ac20c071c.pdf
    • http://files.bgfcky.org/uploads/1/3/1/4/131453573/4e3f15af4741.pdf
    • http://files.crossrdcanine.ca/uploads/1/3/1/4/131407767/9346152.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0484/1193/4878/files/canon_xa10_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/minecraft_economy_servers_with_plots.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/gozatefanetunowed.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_off000069ec.bin
5ce8932d1e40f41e991eb48e9f7358a4d4fb8f9ec9633f1119c491c71be92b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EC 5328 bytes
font_01_sfnt_off00007c07.bin
9ff8e63d5e988e82cff62249fb657cee0f11879a7ac6ac7dcfd0b90196a3b62c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C07 10008 bytes

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