Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d4d159d2b111f8…

MALICIOUS

PDF

56.7 KB Created: 2020-08-18 22:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: acc4f176f6ae485c0aa3df4114df55be SHA-1: b5dc69903506f6ea5a98637f81f5f3678f3851af SHA-256: 16d4d159d2b111f8243400f35f1b84b25ef1bb9ea5bd78beba6c1fa75e5e69c4
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.ru) which is flagged as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to trick users into visiting it under the guise of a download. The presence of a large number of external links, including to benign Shopify URLs, indicates a link farm strategy to obscure the malicious destination.

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=sodium+dodecyl+sulfate+sds+pdf In PDF document text
    • http://files.ae.ariatlandingpage.com/uploads/1/3/0/7/130775983/xatewonagiregimud.pdfIn PDF document text
    • http://files.rutherglenlamaisonstarnaud.com/uploads/1/3/0/8/130814065/092cc0ebdec0a9.pdfIn PDF document text
    • http://bokamovur.foodyounebes.com/uploads/1/3/1/4/131437254/xoroxe_ditewiv_kozuxigal.pdfIn PDF document text
    • http://files.sufiireland.com/uploads/1/3/0/7/130740211/letexa_babonewose_tozexesavu.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/1/0434/6436/0100/files/sinilapikininam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0975/9641/files/gokixuwufemanatevirame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/dapisalupafibazite.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0803/0882/files/the_next_font.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/bed_sheets_meaning_in_spanish.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8256/3232/files/feledododobufupimijisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/82879391703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/lavagamavijezuxozogekiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/4076/3030/files/super_metroid_rom_hacks.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/atul_prakashan_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/fundamentos_de_bacteriologia_atlas_a_color.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6504/1311/files/80614096791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/92881260637.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0144/4514/files/83579604631.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8E 5408 bytes
SHA-256: feab11d826ddcc7ce9445a1e32682e30c4961c1a35f573844d9dbb6bd0f6c101
font_01_sfnt_off0000b0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EA 10864 bytes
SHA-256: 4d528342a98985f4c0ddf968fb2b70b8af95d3f841d007492b70938d4f17e670