Malicious PDF — malware analysis report

Static analysis result for SHA-256 136c2339958ddbc5…

MALICIOUS

PDF

39.8 KB Created: 2020-08-20 13:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f2363946055570e739d125aba73838cf SHA-1: 105dca51b319b7a5ee0c90bf040c23ae64a678ce SHA-256: 136c2339958ddbc5668e82e9730890884540e1f45ac70e5e8d9dbde7c9611dd9
194 Risk Score

Malware Insights

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

This PDF file contains numerous links designed to create an SEO link farm, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The primary redirector URL is https://ttraff.ru/pify?keyword=cestino+android+samsung+j5, which is likely part of a phishing or scam campaign. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=cestino+android+samsung+j5 In PDF document text
    • http://mutitosi.sisterssangha.org/uploads/1/3/0/9/130969521/rurodaduro.pdfIn PDF document text
    • http://bapobo.spiralingheartskidsyoga.com/uploads/1/3/0/7/130739173/vopetogorojum_roxoxik.pdfIn PDF document text
    • http://desadono.anmhomedecorandmore.com/uploads/1/3/1/6/131606490/2f69320dd085.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/1/0431/9887/3763/files/nisojibusuvekiwagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9543/3117/files/ffxiv_fishing_leveling_guide_50-_60.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/9719/8487/files/can_u_feel_the_love_tonight_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/40869855609.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/cantos_del_camino_resucito.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/83184251539.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7507/6258/files/wotupazanirenasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6075/4582/files/71528666348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/7093/2390/files/kasuporomopeteb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1536/5020/files/nexikifez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/sonodavixunibaxonir.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_off00005e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E64 5216 bytes
SHA-256: 7154557f00fd68df027b9795631bbe6a7bdf2e945902c6f00d852ed2b443cb5a
font_01_sfnt_off0000700b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x700B 10112 bytes
SHA-256: 1dcd3efe7256cefe6d77d9150c7a2b4346fe75464fc48e24ad5deaa9fac330d0

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