Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb6505e6ccb56a3…

MALICIOUS

PDF

43.4 KB Created: 2020-08-11 21:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 57e565ede8b41da13c6080c26da4f4b2 SHA-1: fe465a6f3f32566bb2c276d9cb843ec0ec04cca7 SHA-256: 6cb6505e6ccb56a377b3a38db94abee7d412f30c2058df92ce9bf0e1feadb308
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a redirector infrastructure identified as malicious. The document body, though heavily obfuscated, contains URLs that are part of a link farm designed to attract search engine traffic, likely as a lure for phishing or malware distribution. 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.cc/pify?keyword=ejercicio+aer%25C3%25B3bico+y+anaerobio+pdf In PDF document text
    • http://files.brewsterwhitecaps.com/uploads/1/3/0/7/130776168/a5eb161.pdfIn PDF document text
    • http://jawalul.cosplayinkfactory.com/uploads/1/3/1/8/131857054/73437ebb76b4.pdfIn PDF document text
    • http://files.inkybluestudio.com/uploads/1/3/1/3/131379530/720025.pdfIn PDF document text
    • http://files.510radio.com/uploads/1/3/1/1/131164231/e17a7c3.pdfIn PDF document text
    • http://goxojuxa.songmountainwushu.com/uploads/1/3/1/4/131437423/duganu-punejetinuxe-bobofarewuwodog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4799/0934/files/nanemitosal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/4607987350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/jovekawulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/tomufesuvepopefitafilekos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6573/7370/files/mapetolutajefuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/3943/6449/files/sda_hymnal_with_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/49325884660.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/8000762031.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2480/9122/files/35558101653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/darkrp_kidnapping_mod_1._16.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 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9E 5056 bytes
SHA-256: eb558475e313485a85d625acfa4c5b379e4e3fdd499a6c00355af9dc201c428b
font_01_sfnt_off00006f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F94 10036 bytes
SHA-256: c6f15b539967873cd8c569346467f8f3fba4ffdf7ea41f3a12979c3009b2c86c
font_02_sfnt_off00009038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9038 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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