Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a6ec79f37f463a…

MALICIOUS

PDF

33.9 KB Created: 2020-08-09 17:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1f02a0fafd767d9f928e9030fb75f14f SHA-1: 271ae5b530c3d5c0ed4c74583839c239556bc80d SHA-256: c5a6ec79f37f463a7b358c898344a67d3a170314eb826a7be06db339b97480c9
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, appears to be a lure related to a lunar calendar, likely intended to trick users into clicking the malicious link. 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.cc/pify?keyword=calendario+lunare+gennaio+2020+pdf In PDF document text
    • http://ratuzinuk.kinosaurusjakarta.com/uploads/1/3/1/8/131871390/wekufenotunituwuj.pdfIn PDF document text
    • http://joziwofi.myroncotton.com/uploads/1/3/1/0/131070993/3176883.pdfIn PDF document text
    • http://files.bunnywigglebottom.com/uploads/1/3/0/8/130874207/tawojel.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/1/0428/9835/8432/files/libidurekatomanazavevufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/7377/7319/files/bullying_and_cyberbullying_word_search.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/dovudirofofoxokaka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0764/6630/files/jurux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/sevinajokoboba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/velokiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/2215/9772/files/bsc_first_sem_syllabus_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/fozul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/31984218913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/stihl_fs_90_r_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7104/4774/files/frightful_s_mountain_chapter_7.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 1

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_off0000473a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x473A 5212 bytes
SHA-256: 982606b06f7070b3de9905662be7d3b5f56e0d13a1049a876b0ca93227850592
font_01_sfnt_off000058fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58FD 9980 bytes
SHA-256: 8447537b21bc586cef258c0b91278a9a19ce43f93384b762cd9b25bcaf90ba0c

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