Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33ab07dee7839ee…

MALICIOUS

PDF

49.8 KB Created: 2020-11-02 16:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9d757991c1d5d5d7252515883f1b7658 SHA-1: 2e06b3a03573a5c5e8505a3687a4714748559f66 SHA-256: f33ab07dee7839ee18b72d6e3cbc4177cd9643e9ff29c314cda81c048ecfe939
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a critical heuristic identifying it as a malicious redirector and a link farm. The primary URL, 'https://ggtraff.ru/123?keyword=iphone+7+giveaway+no+survey', suggests a lure for a giveaway scam. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains embedded URLs that are part of this link farm.

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.
  • 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://ggtraff.ru/123?keyword=iphone+7+giveaway+no+survey In PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/bopajuporagixinufu.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/xekejovemivofu.pdfIn PDF document text
    • https://sivipafegedijog.weebly.com/uploads/1/3/4/4/134443607/xikurelusob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5f90ba23de817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5f906708d8560.pdfIn PDF document text
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/liguwod.pdfIn PDF document text
    • https://xexofomes.weebly.com/uploads/1/3/4/4/134489610/lonar_lolozaw_wugaketizamo_begozemomofawad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f8b06af6eeeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88508573-8d7c-49ce-8676-5cbd9b5747d8/san_miguel_academy_of_newburgh.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2627/6774/files/insuffisance_surrnalienne_lente.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7404/3069/files/sex_linked_pedigree_worksheets_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3481/8752/files/game_gta_5_for_android_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17f6b2b-c6ef-4824-b490-9cdb2f29b612/goody_s_clothing_store_website_coupons.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_off0000812b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812B 5320 bytes
SHA-256: 629b17793f88b04b297a6af2eda97d881c9395bf771cde671abc7a3fb2e52ea7
font_01_sfnt_off00009364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9364 11608 bytes
SHA-256: 1c5e1f5c355728e59aae92f33913ccfe1c94ee5a66e346623adff8b177ddf42f

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