Malicious PDF — malware analysis report

Static analysis result for SHA-256 61807c5fb3da174d…

MALICIOUS

PDF

53.4 KB Created: 2020-09-10 07:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bdc5196ed0cc4cce4c161c3132140459 SHA-1: 429014f4c8ae0fc5b73cc778a9dbbe2cbe37b96b SHA-256: 61807c5fb3da174df1fd42963141f967fbd7823e797575850701dfdb1ee96495
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs, suggesting a lure to a malicious site. 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.link/wix?keyword=morphology+of+flowering+plants+pdf In PDF document text
    • http://files.wesdoors.com/uploads/1/3/0/8/130873758/8997663.pdfIn PDF document text
    • http://files.vintagerhythmandbluesensemble.com/uploads/1/3/1/3/131384674/zoturolelek_niduramu_liwesete.pdfIn PDF document text
    • http://files.silentwitness.net/uploads/1/3/1/6/131637876/mafabapo.pdfIn PDF document text
    • http://files.emilywahlgallery.com/uploads/1/3/0/9/130969322/nipodavisalasonepaxu.pdfIn PDF document text
    • http://jivebalaz.paintnwithfriends.com/uploads/1/3/1/3/131383309/wejuledenuguve_punovep.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://static.usrfiles.com/ugd/b7082a_97cb81ced46742088e1c14fc562f737f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/911c12_786d210b1ad64f4c9a42c730af0f4606.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/31593d_2f0fd0527fe54afcbf7db8e6c3ff41a2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1c8c1e_9f2fa236d23943aebf0910416f9e693b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e5412a_52ba1c2e1aa7434f98c3b2365735920e.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_off0000868a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x868A 5288 bytes
SHA-256: d91f8c105ea9075b44cba50bb361a99874eae4f40712d25a936fcd9e78b53587
font_01_sfnt_off0000989b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x989B 10040 bytes
SHA-256: 4b438cd66f99615ab119c7b7bf52119f924c77ec56c1b6836069b939cf8d69a8
font_02_sfnt_off0000bac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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