Malicious PDF — malware analysis report

Static analysis result for SHA-256 8812b4c258b693d0…

MALICIOUS

PDF

70.6 KB Created: 2020-08-24 22:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 147e91b04552c63cb14b5fd1f28d1ebd SHA-1: dc08a67663363dd1d9d64b951de964e97ffc4d60 SHA-256: 8812b4c258b693d0524d0d43c3bf7325e1b6d907355c4e9d084f1a905bba1a79
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with a 'template complaint letter for poor service'. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed for SEO manipulation to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=template+complaint+letter+for+poor+service In PDF document text
    • http://files.natureworld.com.au/uploads/1/3/1/3/131379439/woketurip.pdfIn PDF document text
    • http://kuwule.kesara.org/uploads/1/3/1/0/131069934/kemufewotuvemiwij.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/1/0431/1190/7488/files/nugedusoxoluserajabiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1503/5290/files/pikeru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81579197248.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/smart_shankar_movie_hd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/1413985276.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5584/8355/files/17427187365.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4350/1733/files/50493014865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/robifofelegivojiguresi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4333/8912/files/anomalous_behaviour_of_water.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/tijaredubafaluduligam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4798/5053/files/p_c_v_ka_full_form.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_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 5168 bytes
SHA-256: f8a945e0962678be89300ec8580c4f13c9d8fb5aab7a79cec0a4bd523064fb16
font_02_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 10356 bytes
SHA-256: b3dc5ef6df14a0e48d9a060b0dc2dac023a8ce538434a6995dc1d016bd4422e3

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