Malicious PDF — malware analysis report

Static analysis result for SHA-256 13675b81358ab638…

MALICIOUS

PDF

38.1 KB Created: 2020-09-11 17:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 771e3f9747ebe977c8e974167b362478 SHA-1: 18945a6a61e08f6ca0762142c0c3faa966c0e67f SHA-256: 13675b81358ab63848e58f96e4dda65fc69ae65ed95c40ed06a84b6e7d5ddeae
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one identified by heuristics as a malicious redirector. The presence of a large number of external PDF links, many pointing to benign content, suggests a link farm designed to obscure the malicious redirector.

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.link/wix?keyword=annamayya+sankeerthanalu+lyrics+telugu+pdf In PDF document text
    • http://files.makeupbysherrijo.com/uploads/1/3/1/8/131872087/7267640.pdfIn PDF document text
    • http://files.globalubuntu.net/uploads/1/3/0/7/130775245/4076056.pdfIn PDF document text
    • http://files.wagsbarkery.com/uploads/1/3/0/9/130969188/d449df692b.pdfIn PDF document text
    • http://files.jemun.net/uploads/1/3/1/4/131437538/zimef-pafitakimu-kazuwapofi-xefulogekasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/f65518_94c69d2f48124aa59ae37bada546d666.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/77941b_5a993a6babf44680a251232976b97a23.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/834936_94f5d3965b6047579d7ca46be05b1800.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5262df_127729f4db804104b9213b7b85bca158.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3c2e2e_d779b49e9bff4c9daf019cf16d52076f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/764aaa_d62f328b6504495c950f4c1a25630263.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0251f0_9bfe56f0f1ed44e59fbc27de64b15bc9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ffe0d3_fb5324565d7241d0b956f0a8f2d06df6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/11baf9_f636ca62a6bf49f1a9ce8b26cf1fcc10.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b2ba6b_a6d2dee3053a40f2a35056220e0b496d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7dfe85_abc96ea1dd664efe839dc7f2c3ffbc73.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b1b3ad_211ed6e9c0aa4551988abd12cedd2eea.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/74a852_c029052fcfe14549b500c45c8078e914.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_off00005581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5581 5724 bytes
SHA-256: 13422bfac52fa534aaddbdd8066e46f58823fe8c7d92c0f1e8b563fa38c64bf1
font_01_sfnt_off000068ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EA 10088 bytes
SHA-256: 84e3d9799499f73551a15f4bd9c3ac1f9cc93df31c5dfc4b089a119b72da558e

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