Malicious PDF — malware analysis report

Static analysis result for SHA-256 6256a4a5ec4f3f4a…

MALICIOUS

PDF

45.9 KB Created: 2020-08-27 20:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ef403b99910dfd6511c7c695429f8791 SHA-1: e103f23dda991f2d109f6c5af5d44388ed1cf53d SHA-256: 6256a4a5ec4f3f4a21ea106d1917d2e377a89377e07d8c55e66073519ec7513f
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 known for malicious activity. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=amperimetro+de+gancho+pdf', which is also flagged as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to trick users into downloading malware or visiting phishing sites.

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.com/pify?keyword=amperimetro+de+gancho+pdf In PDF document text
    • http://files.kctaste.net/uploads/1/3/2/7/132740700/f94d59.pdfIn PDF document text
    • http://files.abrushwithnature.studio/uploads/1/3/1/4/131406885/184799.pdfIn PDF document text
    • http://sinomata.northwestpetroleum.com/uploads/1/3/0/7/130740514/wokimala.pdfIn PDF document text
    • http://files.escondidofoundationarch.org/uploads/1/3/0/7/130775520/ziburisalewa-jilutawe-bidusida-pokipepif.pdfIn PDF document text
    • http://jekovu.lwcmusic.org/uploads/1/3/0/8/130874276/nadafageluxase-vomemanetuniliv-zewivafur-ralipokesakames.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/1/0451/1091/9321/files/alter_ego_a1_french.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/student_exploration_calorimetry_lab_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/41847164348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/5129/4376/files/esmo_consensus_guidelines_colorectal_cancer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3789/1487/files/gerogivelesavomu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3708/8154/files/min_heap_insert.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0020/9319/files/jarexafiwarozorimofibaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/converter_bmp_to_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4527/3248/files/calidad_estratgica_total_total_quality_management.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8712/5927/files/xezaruxefiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2580/0087/files/dobupemetasot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4527/3251/files/17224283252.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6470 5136 bytes
SHA-256: ab299463ae723b94329ec1f9fe9d5093d709cb339d7313050cdcc26edb355136
font_01_sfnt_off000075ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75AE 11544 bytes
SHA-256: e87df0b7d52229c726cda4087038a52f43fe06e24c48e3258ff9fa5ae5cee7d0
font_02_sfnt_off00009b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B13 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3