Malicious PDF — malware analysis report

Static analysis result for SHA-256 85128f51cbb27a29…

MALICIOUS

PDF

134.4 KB Created: 2020-08-11 06:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 18a723abe6b407163a726d5b181f47f1 SHA-1: 33b52f35b8284bb82f78506be4a9b050efbd7d59 SHA-256: 85128f51cbb27a296ee0bc1d17e2744887b3ac0fb215289e5d9b38719e0ee01e
194 Risk Score

Malware Insights

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

The PDF contains numerous links designed to create an SEO link farm, with a primary redirector pointing to a malicious URL. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for 'Attacco dei giganti manga pdf'. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=attacco+dei+giganti+manga+pdf In PDF document text
    • http://files.stanfordstudentactivities.com/uploads/1/3/0/7/130739401/xudezaverimi_pefamozome_lofafatite.pdfIn PDF document text
    • http://files.morethansoulfood.net/uploads/1/3/1/3/131383602/4830135.pdfIn PDF document text
    • http://files.ruthdellinger.com/uploads/1/3/1/4/131438379/9615385.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/1/0429/5468/6617/files/rovamavi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6303/3502/files/11920559182.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1165/3282/files/baseboards_for_model_railways.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8325/9301/files/70694857930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/12154932619.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8875/6374/files/alcon_rebate_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0751/6565/files/tangled_full_movie_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/80959855106.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/22772482717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4263/4917/files/admonishing_ray_pathfinder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bipifapokuwegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9151/5805/files/centrifugal_chiller_operation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 58692 bytes
SHA-256: 86df7fb035c9eff2935f865bceea53e27f4934870279dbebc00f17f07568932b
font_01_sfnt_off0001d2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2A5 5156 bytes
SHA-256: 06dae38ec482ddd7469149aef9b9933a800b86dde4bfea71356f608deb8664e1
font_02_sfnt_off0001e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E420 11796 bytes
SHA-256: 22ea6dec1d3d1f0e832be81b1eda5703989179cc61c961222879219f524d193c

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