Malicious PDF — malware analysis report

Static analysis result for SHA-256 698ea7fc1a90c7f5…

MALICIOUS

PDF

43.2 KB Created: 2020-07-13 21:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 92534311a0d16ea01e32bcc0b1534028 SHA-1: 14a176e2c9ae6b583c504d0a6bf124e441110e54 SHA-256: 698ea7fc1a90c7f5920ddf2307b12ec31a66a3258cdd558445f5966129945c0b
194 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as sample papers for a cyber olympiad, but these links lead to SEO redirectors and ultimately to other PDF files hosted on various domains. The heuristic firings indicate that these links are part of a malicious redirector infrastructure and a link farm, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the primary attack vector appears to be social engineering through deceptive document content and malicious URLs.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.cc/wb?keyword=national%20cyber%20olympiad%20sample%20papers%20for%20class%206%20pdf In PDF document text
    • http://files.saban-kazim.com/uploads/1/3/1/8/131871644/01cf269ea.pdfIn PDF document text
    • http://files.secondtonunframery.org/uploads/1/3/2/6/132681482/5800604.pdfIn PDF document text
    • http://files.whistlingfrogresort.com/uploads/1/3/2/6/132681002/masaberilanimubaloji.pdfIn PDF document text
    • http://files.leidenmanifesto.org/uploads/1/3/0/8/130874237/banuxamamefinu_kozosufepeg_wijuzumu.pdfIn PDF document text
    • http://files.lavenderlanemi.com/uploads/1/3/1/4/131453934/01379b0daec873.pdfIn PDF document text
    • http://files.dkdynamite1.com/uploads/1/3/1/4/131407263/kojizim.pdfIn PDF document text
    • http://files.livignoexclusive.com/uploads/1/3/0/7/130738700/338839.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://surirupuje.files.wordpress.com/2020/07/dugowinedavisajage.pdfIn PDF document text
    • https://depitexexu.files.wordpress.com/2020/07/tibed.pdfIn PDF document text
    • https://tolefeguxi.files.wordpress.com/2020/06/kezumebabelutilugit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/giloxom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/fidezorozikonabaduzanipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3774/4534/files/gobovuvadanudena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/xixibapugizivulutetomas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/9202199494.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/18853405402.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21154843933.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3D 5456 bytes
SHA-256: 18646ae0e6b04d335b51f7833a67cb7d9af9ad220b0a7454e0d801c3b9fe8b99
font_01_sfnt_off00007dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAD 9852 bytes
SHA-256: 48da1c0762f370aec881ab55b9040c86bbc4124ad653d95f560825a0725a95f7

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