Malicious PDF — malware analysis report

Static analysis result for SHA-256 885fd8f36012fb26…

MALICIOUS

PDF

50.8 KB Created: 2020-08-14 23:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cddaef273aa840782cf957b90a3ba2ff SHA-1: 90b16324cbe0f9a986b2aa97fd4ff06eda3cab4e SHA-256: 885fd8f36012fb26248e488bb9360dcbeb18e1117685aa86929d02b30d4deccf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary redirector URL, https://ttraff.ru/pify?keyword=algorithme+exercice+et+solution+pdf, is flagged as malicious. This suggests the document is part of an SEO link farm designed to lure users to malicious infrastructure under the guise of providing free PDF resources.

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=algorithme+exercice+et+solution+pdf In PDF document text
    • http://files.irchstheatre.org/uploads/1/3/0/8/130814714/7900484.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/1/0436/3524/5214/files/hexadecimal_color_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6794/6648/files/dotapot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/b_com_books_in_gujarati_medium.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/52617156308.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/discord_isn_t_detecting_my_mic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/futata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/0652/9434/files/sepagosebenenipibulapiku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/fususuxasifedimisate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/90489830339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5863/3627/files/foluvup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0387/0375/files/arnold_ehret_mucusless_diet_healing_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/telaxozuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/iambic_pentameter_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/74875400878.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFA 5300 bytes
SHA-256: 84ca169893e78c49dedaf7d6d848cc3bc48b49cf73ef0e09e7d1148ab2610ff9
font_01_sfnt_off00007de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE3 16140 bytes
SHA-256: 42b466df045016ce223f7216866128650756e1455e97e8c72449aee54840e700
font_02_sfnt_off0000aff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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