Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1b6e8c8fbf77a3…

MALICIOUS

PDF

40.2 KB Created: 2020-08-05 22:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4c9234d591891ecf72064a198cf3e1ce SHA-1: a11e0f7985bee82f07efa0e65c52f87bcb6542eb SHA-256: 7f1b6e8c8fbf77a3960a56be05d59c762b515cba80ceac02cf54cc2d130b8d10
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text and URLs that suggest a lure related to biological life cycles, likely to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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=diphyllobothrium+latum+ciclo+de+vida+pdf In PDF document text
    • http://files.classwithchris.com/uploads/1/3/0/8/130874457/wopogoxijukarodu.pdfIn PDF document text
    • http://files.newmexiconeuromuscular.com/uploads/1/3/1/6/131607374/1223425.pdfIn PDF document text
    • http://files.organicallyhers.com/uploads/1/3/1/3/131398075/zutesononadu.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/1/0434/3080/5671/files/84108413636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9748/7512/files/jojuvameguvofukibuwef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/581871399.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3266/4481/files/pafojizawaxusur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/stud_bolt_dimensions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7994/0761/files/kitemikojofukofuwubabaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/65568673559.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4440/4374/files/5545780006.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8145/8069/files/2381485983.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/3932021203.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/juvajiri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8702/6581/files/wowirotubetug.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 5

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_off00005efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFE 5520 bytes
SHA-256: 0313d3e43fa8eb0809370fe2a3c9b915bd853faf6b27d16c2edad34f9b04928a
font_01_sfnt_off000071a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A3 10004 bytes
SHA-256: 196247182781a81901a05ea6ad83f23f2e57ab0749908cf642e8e1879c98f92e

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