Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c8e524405f712e…

MALICIOUS

PDF

53.0 KB Created: 2020-07-29 10:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7f893f7f3ebfb54db6f72dee108260a4 SHA-1: 7b2c2a68e089aefc542600f1512167f89291ac61 SHA-256: 16c8e524405f712e6a8630f49955d9c8f37ce265a124bf2056d9879b26188f86
194 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as free downloads, but they redirect to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is part of a link farm aiming to redirect users to malicious sites. The ML classifier also strongly suggests 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=african+countries+and+their+capitals+and+presidents+pdf In PDF document text
    • http://files.waindustrialsupplies.net/uploads/1/3/1/1/131163867/17bd03.pdfIn PDF document text
    • http://files.evaatkinson.com/uploads/1/3/0/7/130776499/1314805.pdfIn PDF document text
    • http://files.vetspouse.org/uploads/1/3/1/8/131858540/sumomevazuforiraloz.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/1/0431/8865/0142/files/92085567053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/lonewufexodo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1021/9422/files/suwovegotab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xogasetixudaxaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6716/3302/files/80004646763.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vozazugimutiwobawaxuleg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/rorafixodusotipuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/46073943196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/faparejefoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/89751755027.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 4

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_off0000839f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x839F 5116 bytes
SHA-256: 64911821250cda1c4720f8a4e63dea54e092ea7429745491bcaa526a42c958eb
font_01_sfnt_off000094ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94EE 15380 bytes
SHA-256: 6652ac1398ced5060353058b1485af4770963c8ef6b4b2f936190502e4d4339c

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