Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c028266b61821be…

MALICIOUS

PDF

40.4 KB Created: 2020-08-10 16:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 092e422f462b50f03c69107133d10a0d SHA-1: ded26809d7284d64f301a0967393622deb0e240b SHA-256: 3c028266b61821be979de1bc2414099c8714c4217251b604a8de50cf5ed787bc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to a redirector service (ttraff.ru) that is known to host malicious content. The document body, though heavily obfuscated, contains references to these URLs, suggesting a deliberate attempt to lure users to malicious sites under the guise of providing PDF documents. The ML classifier also strongly indicated 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=thinkertoys+by+michael+michalko+pdf In PDF document text
    • http://files.jhmtva.com/uploads/1/3/0/7/130739704/nurewifinimemelox.pdfIn PDF document text
    • http://files.entropicj.com/uploads/1/3/2/6/132695300/850b8f.pdfIn PDF document text
    • http://files.affinity-artwork.com/uploads/1/3/1/8/131856333/2db9a57eab5.pdfIn PDF document text
    • http://files.diled.eu/uploads/1/3/0/7/130775229/3528953.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/1/0428/4288/2215/files/55420355966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/58330585564.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6630/1343/files/doggy_style_emoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4950/0315/files/xalarefajog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/denetararoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6295/1074/files/wuwuwisuge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7614/8643/files/79059682388.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2623/6063/files/depogizakewenapoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/53951641179.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
🗂 Part of campaign: sprinttriathlonchestnutforks.com 5 samples

Related samples 7

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_off00005fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE4 5648 bytes
SHA-256: d0fa387f03ecc13e79864df22d0d2a3d7a48ac73f20a31f8455e6048006e0f3a
font_01_sfnt_off000072e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72E8 9992 bytes
SHA-256: a392188a2905d76fff175e8c1c2b3df93d9f70718d3f2577090cd6f3d0b7ab8d

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