Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a7873f29bf99c2…

MALICIOUS

PDF

54.8 KB Created: 2020-08-16 22:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3a62ad565eeebdf196595ca45a91d6fa SHA-1: 615794b8d17a5766d0b124a9093e4a432ef8fa34 SHA-256: 87a7873f29bf99c2539ad886f80c0b2dc91da9378334a40b0facfae4aa73f65d
202 Risk Score

Malware Insights

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

The PDF contains numerous links designed to create a link farm, with a primary redirector pointing to a malicious URL. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure users into clicking it for a fake download or information. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=characteristics+of+every+accounting+information+system In PDF document text
    • http://files.emilynemchickediting.com/uploads/1/3/1/6/131637484/3310305.pdfIn PDF document text
    • http://files.blazinb.com/uploads/1/3/2/8/132815015/38c89630c3000c.pdfIn PDF document text
    • http://punesejo.torilaynepermanentcosmetics.net/uploads/1/3/2/7/132712354/78eb935142cd2.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/1/0437/1962/2808/files/10139115563.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/verizon_fios_channels.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7754/9726/files/60253903991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/kiloriwep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5361/2182/files/fallout_4_perk_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9135/1969/files/free_online_hidden_objects_no_downloads.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/44201005844.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6588/4323/files/10247835935.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/vixexerofoxetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/data_structures_and_algorithms_made_easy_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3151/0690/files/amleto_testo_integrale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6240/9881/files/mandated_reporter_law_michigan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9322/0766/files/estadistica_descriptiva_ejemplos_resueltos.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_off00009774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9774 5328 bytes
SHA-256: 6e50b56d804f9560e5a7e351dc1f90542a76ded7ba51f93d8d02cf4c066039c0
font_01_sfnt_off0000a976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA976 10596 bytes
SHA-256: 5123ac1f3e7ca03bbced5498fb73fd134612b1213e4b9f3a48a46648dbf9c1a8

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