Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dd678b4a0dae58…

MALICIOUS

PDF

35.2 KB Created: 2020-08-21 07:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 80054e89a0ea3d574dc53938843ba394 SHA-1: 7cab89c049485bb3e4643c30d4181f6dbb31008b SHA-256: 18dd678b4a0dae58a2bcc35a5b2cecda03c0f0636f02a9eb593087d9b8772aa4
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains multiple links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=kambikuttan+net+pdf'. The document body, though heavily obfuscated, contains references to this URL and a large number of other PDF links, suggesting a link farm or phishing attempt disguised as a free download. The primary IOC is the malicious redirector URL.

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=kambikuttan+net+pdf In PDF document text
    • http://files.bowerslab.org/uploads/1/3/1/3/131398102/9d47e.pdfIn PDF document text
    • http://files.sophieknab.com/uploads/1/3/0/7/130739544/gedegigubaziku-bofoxo-pabevu.pdfIn PDF document text
    • http://files.crackedbreakfasttruck.com/uploads/1/3/1/1/131164198/7020449.pdfIn PDF document text
    • http://files.greeneryarts.net/uploads/1/3/0/7/130739747/pasapikaruroj-gijofitidova-bujodegubowegu.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/1/0433/8827/2807/files/77978925480.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1058/0902/files/basic_plc_programming_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/palabras_basicas_en_ingles_y_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/nuketown_bo3_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7361/8599/files/23826408040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/raxadopadikozopoxetopa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/jataxakanovevikona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/gleichungen_lsen_klasse_7_aufgaben.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9255/7462/files/819863724.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 6

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_off00004ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB7 5052 bytes
SHA-256: 2ce975693535516df5b79a7dad4c3decc9a0c33ac71f00b895e3787ac49ddce5
font_01_sfnt_off00005bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD9 10704 bytes
SHA-256: 097c4117f36e998a73f833bf523de7512d54c89636e9f512b26a7ec82c430d63

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