Malicious PDF — malware analysis report

Static analysis result for SHA-256 1443c4f9c1b90f62…

MALICIOUS

PDF

43.2 KB Created: 2020-08-22 12:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35fa50e284cc5f4233cb96f07e7fcfc4 SHA-1: a00a87ac4d4d9d755c5173c703a9402406e8a119 SHA-256: 1443c4f9c1b90f627151f9763901ba91750d9869a297862f21311b0a2b81acc7
154 Risk Score

Malware Insights

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

The PDF contains a prominent link that, when clicked, directs to a malicious redirector infrastructure. This infrastructure is likely used to host or deliver further malicious content, such as malware or phishing pages, under the guise of a software download. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed for SEO manipulation to attract victims.

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/pify?keyword=audacity++free+full+version+with+crack
    • http://kolobaga.briana-jenae.com/uploads/1/3/1/3/131379578/xazuviginuvosib-nodoxelagajolad.pdf
    • http://kogofaxe.dianastarr.ca/uploads/1/3/1/3/131384600/650814.pdf
    • http://files.worcesterdogs.co.uk/uploads/1/3/2/8/132814791/3600534.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/zerisavuganiwizilifixe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/23345935007.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/psc_bulletin_december_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/avian_influenza.pdf
    • https://cdn.shopify.com/s/files/1/0456/8616/1567/files/movie_company_intro_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/stock_market_holidays_2016_usa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/kesateboxorozuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/vegisomerugunuparopuve.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_off00006b4c.bin
159a6799c287f74bd464983568c11f605afd5d30ec891aaacf31ac3f0986cc78
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4C 5416 bytes
font_01_sfnt_off00007dc5.bin
15f0e36ef75197a0df6500cbe53500e50227a1bcd8e79cf87b9d9654ff122aac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC5 9968 bytes