Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7cc2d8e98e7c75…

MALICIOUS

PDF

38.9 KB Created: 2020-08-01 22:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9eaebce0e3d385d9bce1d91b22acc3e3 SHA-1: 9b921d96cada9016465d6754feba748f87081cae SHA-256: 8f7cc2d8e98e7c75e7f42d589283ce168188d158265b84182beb35a5af774e05
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wb?keyword=neuroplasticidade%20e%20autismo%20pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, further supports a link farm or SEO poisoning attack vector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/wb?keyword=neuroplasticidade%20e%20autismo%20pdf In PDF document text
    • http://files.dlfinancial.org/uploads/1/3/1/3/131379749/tobij.pdfIn PDF document text
    • http://files.taniamcmurtry.com/uploads/1/3/1/3/131380841/74528.pdfIn PDF document text
    • http://files.lifegivingcounsellingandtutoring.com/uploads/1/3/1/4/131437889/11fc1d145.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/1/0435/4765/6343/files/zutepobopakepe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/zakevaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6996/4439/files/ximudarunalizuboromoxiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/vevuli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/69943675715.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ximulomonarosaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/24845388672.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/wuvotapaduker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3990/6209/files/rumufujejimometetugud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6701/4297/files/xetotitovumijonoro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/31003003466.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_off00005618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5618 5268 bytes
SHA-256: 8ab5c3bc454aad9afb0e822efe7eafd8d993f5c84e3205757e1298144190dad7
font_01_sfnt_off000067ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67ED 12324 bytes
SHA-256: c46260e25b09da5732f4757e975c6003d45017a56a61c0de51162dfb12727743

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