Malicious PDF — malware analysis report

Static analysis result for SHA-256 821f82108c5f3bc3…

MALICIOUS

PDF

46.7 KB Created: 2020-08-23 17:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 24b648272d5397037e827441549d447f SHA-1: 9b96148634ac6516da977835e0f6a3ea4bc8562f SHA-256: 821f82108c5f3bc376b9352e4808c47bde2a6264e22dec21a2a0f5e448124b96
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirection and a link farm, with a critical finding of a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL pointing to a redirector service. This suggests the primary goal is to redirect the user to a malicious site, likely for phishing or malware distribution.

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.com/pify?keyword=ideology+and+ideological+state+apparatuses+althusser+pdf In PDF document text
    • http://files.arborparkpto.com/uploads/1/3/1/4/131410818/fe74ca4.pdfIn PDF document text
    • http://bokal.summitflash.com/uploads/1/3/2/7/132712326/derobiditijujid_fererisobas_mejefofape.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/1/0432/5877/3662/files/98887687479.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/reduce_size_acrobat_reader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9620/2652/files/ben_10_alien_swarm_mp4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/85554843030.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/zavuduzoduvarexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/26871035344.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9241/8468/files/nolab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/taliletilepoxekibunod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/mini_chopper_plans_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4868/9050/files/vscode_format_code_java.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/62330679950.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 2

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_off000078cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78CB 5456 bytes
SHA-256: 8727d43068af7a6d9bdf7fa2d91463e7135a0088ac6b8f45ef2018dfc64319d5
font_01_sfnt_off00008b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B57 9964 bytes
SHA-256: 58b90acb7a92d0dfd4e3dc1abf783443ee97e21479d64245b67813d646795ba8

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