Malicious PDF — malware analysis report

Static analysis result for SHA-256 63881ca4bba24523…

MALICIOUS

PDF

39.9 KB Created: 2020-08-15 22:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f36def71587dd7e518e0fc492fe49e7 SHA-1: f9f0eee68aff520175003b14d39e44be13e64449 SHA-256: 63881ca4bba24523e9e7ec615cbb985a2ac21d97485c599ddff43c3350eff9e2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially obfuscated, includes the same malicious URL and references to other PDFs, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness, supporting the conclusion that this file is designed to redirect users to harmful content.

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.cc/pify?keyword=carnivores+ice+age+latest+version+free
    • http://files.skateyogi.com/uploads/1/3/0/8/130813757/damewizuw.pdf
    • http://files.overlandcruisersmt.com/uploads/1/3/1/4/131406701/suwote_nozoxaj_rekigezawerejep.pdf
    • http://files.namibiatourism.info/uploads/1/3/1/4/131407647/megemogu.pdf
    • http://files.literallyanythingmovies.com/uploads/1/3/1/4/131437601/6fa45202a48f3b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/starcraft_mass_recall.pdf
    • https://cdn.shopify.com/s/files/1/0440/9081/8712/files/vebukegebavijoluxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/kefamojadisakoguxix.pdf
    • https://cdn.shopify.com/s/files/1/0429/8063/8879/files/introduction_to_abnormal_child_and_adolescent_psychology_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6140/files/online_editor_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/pesuzevajuku.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_off00005dba.bin
2d4c584b459c230106642ce83c06e6ce1343e9d02a54890a77aacede32e69f77
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBA 5012 bytes
font_01_sfnt_off00006ee3.bin
096b580ab9124ae5d8c3ca465cee13e3b4e623bd48170397e8be8daccd16755a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE3 10416 bytes