Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb9f6218c6cf5e4…

MALICIOUS

PDF

40.6 KB Created: 2020-08-22 04:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b18712cfb2a5e791d31f886a0b77b62b SHA-1: 2d38c140bfcdea1cd17f7bb1149900cf662e4f0b SHA-256: 4bb9f6218c6cf5e41949f62b2d9d9c92154a2e51307811a75a9675242c72788b
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains references to 'yearly calendar 2019 excel' and a URL that aligns with the malicious redirector. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination and potentially improve SEO for malicious content. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

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=yearly+calendar+2019+excel In PDF document text
    • http://pitilodu.truccoaustralia.com/uploads/1/3/1/0/131070872/b2436c0e234b1.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/1/0437/3292/6615/files/performance_evaluation_sheet_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/31331552486.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/vexegujufejafozuwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0369/9615/files/tomebivenurafowowowud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/netflix_video_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/melexibazizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9970/9855/files/answer_key_flyers_1_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/game_tencent_android_terbaik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/tulawubunewowuwenepari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/reynolds_adolescent_depression_scale_2nd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2033/6807/files/37027736205.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_off00005f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F88 5368 bytes
SHA-256: 86b1e4d1bf8770caa70ca631c10549f4ffb681013357ef0c8940d666a5c38f9f
font_01_sfnt_off000071e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71E5 10672 bytes
SHA-256: fff13fc6163aaca026587413b6e687f705a5c7abaedcb2ba99aa9be39d4ad451

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