Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e6ca136b96d621…

MALICIOUS

PDF

47.3 KB Created: 2020-08-12 04:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 644b15ede2c15653e36f493e1b6cc495 SHA-1: 355f2654fe02b80ab3c6ede7eb897b80d1229704 SHA-256: 99e6ca136b96d62137cd569441c1227984a2d6ef58163d419302891cd41c7c14
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document body text and embedded URLs suggest a lure to convert PDF to Word documents, leading to the malicious redirector. The presence of numerous external links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content. No scripts were extracted from this sample.

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=convert+pdf+to+word+doc+mac In PDF document text
    • http://siwidake.taniastavreva.com/uploads/1/3/1/6/131637836/780806.pdfIn PDF document text
    • http://files.tankuanaw.com/uploads/1/3/1/3/131379612/eda4253071.pdfIn PDF document text
    • http://files.essexvet.com/uploads/1/3/1/1/131163599/jikur.pdfIn PDF document text
    • http://wujonux.specialhandsgroup.com/uploads/1/3/1/4/131454373/53b87995ca045a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3626/2052/files/abaqus_theory_manual_6._14.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetelonum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/farerunalisukotapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/advanced_analysis_of_algorithms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9153/2699/files/mujudat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1413/4692/files/gigekaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/2004_ford_explorer_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4214/3388/files/sibutuposururowenumudarez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/429325084.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_off00006e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E21 5008 bytes
SHA-256: 410a9783b69b43cf2a5209ac571ea67b28170f6d146b4a5e35959bdf0a71daec
font_01_sfnt_off00007f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F21 10456 bytes
SHA-256: 970334852dabc88744109fb2c3f2881267a596c812bc48d544062b2a6e833515
font_02_sfnt_off0000a2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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