Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b66bbe3a3162c9e…

MALICIOUS

PDF

47.1 KB Created: 2020-08-20 23:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a553fa41e15de9526ff11f3addd5ad8e SHA-1: 50f48706bc76aa352f4d8a31d92fb99f074fc775 SHA-256: 0b66bbe3a3162c9e4748c6a2b1e6c82963ab8601b75270fce8798a229f677430
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to SEO-optimized PDF files, suggesting a link farm or content stuffing tactic. A critical heuristic identified a link to a known malicious redirector, `https://ttraff.ru/pify?keyword=gemsy+industrial+sewing+machine+manual`, which is likely the primary malicious payload delivery mechanism. The ML classifier strongly supports the malicious verdict.

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=gemsy+industrial+sewing+machine+manual In PDF document text
    • http://files.sassysproutnutrition.com/uploads/1/3/2/6/132695273/be3310.pdfIn PDF document text
    • http://kadodevi.adelantechc.org/uploads/1/3/2/6/132682878/siwiruba-lebuduj-bunibuzowiwo-vofuxa.pdfIn PDF document text
    • http://files.k4amg.org/uploads/1/3/1/3/131384024/20d7d2d136.pdfIn PDF document text
    • http://bazos.hinzmanushistory.com/uploads/1/3/2/7/132740541/sutafazepis.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/1/0434/7763/1126/files/16517467556.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7781/9802/files/67742383496.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9158/3391/files/discworld_collection.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/adobe_scanner_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/the_systematic_design_of_instruction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/52983573214.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/fidoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/mokekotorodaduzizugukofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/labofamupufubigi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/tutifuveribetenezevexugej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3235/4727/files/21342733626.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7867 5576 bytes
SHA-256: 525526789c701171a3556bc61219d8b6ef53b66855417d42cae4f94510c555b0
font_01_sfnt_off00008b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B45 10732 bytes
SHA-256: a3a582c20c2f3037010a678141e492a88ca46db50bec419b8dc20b8e57514c10

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