Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1641fecb1678691…

MALICIOUS

PDF

40.3 KB Created: 2020-08-20 00:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1d4955006c9e8aab37e407e833acef32 SHA-1: 26a0e21f44db074528c78faa351ec0b3b4ccd9bd SHA-256: b1641fecb1678691ec9ed151100d08520503af6aedae322eab0094ac7da849f1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The document body contains obfuscated text and embedded URLs, including 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.cc/pify?keyword=kekaha+surf+report In PDF document text
    • http://files.aarpchapter3240.org/uploads/1/3/0/9/130969346/ruviduduwiximijabava.pdfIn PDF document text
    • http://retiti.stpetersaratoga.com/uploads/1/3/1/4/131406893/zulazo.pdfIn PDF document text
    • http://files.nicoleolsthoorn.com/uploads/1/3/2/3/132303189/e3f6b1e7967d.pdfIn PDF document text
    • http://files.anchoredhomedesigns.com/uploads/1/3/2/7/132740552/3807204.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/1/0433/8758/4675/files/73265849822.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/rekikoledozoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/jelovetokig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/sopanov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/7334/3383/files/adverbial_phrase_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/dadiresikasepatum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0939/2285/files/69020027750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5783/0298/files/78416761667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2295/8248/files/xijixor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dotedijulukamani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/2567/4919/files/various_routes_of_drug_administration.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 6

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_off00005973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5973 4988 bytes
SHA-256: aafd4177669e47dadc6f1a14eac360891dcc231b03d4200435dcc46132054139
font_01_sfnt_off00006a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A63 13888 bytes
SHA-256: f5c9d919d0543d61ca33cb258aea8d1cb1682c4f237f319f87f3bd828b4311c2

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