Malicious PDF — malware analysis report

Static analysis result for SHA-256 766a68e2091345a9…

MALICIOUS

PDF

50.3 KB Created: 2020-10-24 02:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c80f7046b96cec86d5f2731eb909405d SHA-1: e65962ff4013c5ed0f21017ed7c25f3adcedfc93 SHA-256: 766a68e2091345a9673c9497d1d843b20165b0f3ab80c34ea4956aeb9a63a864
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=guitar+fretboard+notes+wallpaper In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f8e437f62ee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8834382a4c9.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/9eb16d443b80a.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/vumizutiwetox-tijod-vunevazan-najobivifam.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/4967626.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/2176594.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/3128930.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/1/0477/1489/3980/files/wexet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3165/3273/files/new_odia_mp3_songs_odiapk.in.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2813/2252/files/88419245544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3434/0259/files/40460076863.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/66283531717.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/wiwaribokonuropobewujid.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/d_d_baby_bestiary.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/famivef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe57fab-23b7-41e8-b072-4b42f4ee98be/exercicios_probabilidade_ensino_fundamental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ded2fa-11e0-43b1-a71c-ce114b3f580f/vevaduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e38235-69e8-4424-bc3a-ddb8fa8fb935/american_film_a_history.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000093c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x93C8 24100 bytes
SHA-256: f768c805c2d016bdf6ab263a08db815344129960b427fc7b7fa3256929f89fbf
font_00_sfnt_off00005e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E27 5296 bytes
SHA-256: a5958b61ac432de9d0c38f9a73cd3e83edd9071ecfa68f484f6a5f4b245c273d
font_01_sfnt_off0000704b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x704B 10376 bytes
SHA-256: 65e5cf6430bc27a95a658bfdab0d66a22ca4fd4afe16588725043c349f7d3451

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