Malicious PDF — malware analysis report

Static analysis result for SHA-256 664235bc7d9c048f…

MALICIOUS

PDF

36.5 KB Created: 2020-08-11 22:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cb4e1d40d1197afb070f768ac7c1b31c SHA-1: b5cb83f6084372165cc2be702dd7730124935aca SHA-256: 664235bc7d9c048f2a9ca968334a76aa4f9335c30a34976b8fc1776ad748bcea
194 Risk Score

Malware Insights

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

The PDF contains a link disguised as a free sheet music download, which redirects to a malicious URL. This is a common social engineering tactic to trick users into visiting malicious sites. The ML classifier strongly supports the malicious verdict, and the presence of numerous links to external PDFs, many of which are SEO-optimized, indicates a link farm designed for malicious redirection.

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/pify?keyword=sisters+white+christmas+sheet+music+pdf+free In PDF document text
    • http://files.angiezinserphotography.com/uploads/1/3/1/6/131607866/duledelewununiper.pdfIn PDF document text
    • http://files.falinzhang.com/uploads/1/3/0/9/130969206/6000992.pdfIn PDF document text
    • http://files.cookislandsoptometrist.com/uploads/1/3/1/6/131607029/186d53c3b68079.pdfIn PDF document text
    • http://files.corsettiparalegal.com/uploads/1/3/1/6/131636692/8563576.pdfIn PDF document text
    • http://files.iseil.org/uploads/1/3/1/3/131380397/fanajijosis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/j_ai_saign_blaise_cendrars.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/29808376554.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/vilulabonozuwumipigegotix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/mufradat_al_quran_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/anthropological_theory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/jasawelotopebemolelatudur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/pellegrino_artusi_libro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9376/0931/files/sahih_al_bukhari_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7512/5919/files/john_deere_870_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/nupuzoxalinivozexoxifu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2904/4119/files/64412333860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/wiraguguvusewazumo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2260/4695/files/nusajufapipubegekod.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5C 5560 bytes
SHA-256: 873363883082bd4413a1686891992f502aa3b7534f607fd0625b1a70b613ed37
font_01_sfnt_off0000602a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x602A 10124 bytes
SHA-256: 1322541e92b18c6a69c97bdc7cc268f4b99ed4f07b7737e3ac8d3b61fd4e62df