Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c36ef21b30f112e…

MALICIOUS

PDF

50.0 KB Created: 2020-08-16 20:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f97b0723d7af32f25d18c8924e0010e SHA-1: 68e0cd1851434856eb90dd1534a43d737071afa3 SHA-256: 4c36ef21b30f112ee3efe383e95ab7c67375fb35bdf6f988dd404ca73ce9553e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file is identified as malicious by an ML classifier and contains a critical heuristic firing for a malicious redirector link. It also exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external PDF files. One of these links, 'https://ttraff.ru/pify?keyword=comprehension+worksheet+grade+3+pdf', is known to lead to malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'comprehension worksheet grade 3 pdf', suggesting a lure to disguise the malicious intent.

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 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.
  • 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=comprehension+worksheet+grade+3+pdf
    • http://vadataxon.veeartsy.com/uploads/1/3/0/8/130814328/mikawojemipine.pdf
    • http://bojibuki.ashlynmariephotography.com/uploads/1/3/2/6/132681513/4565382.pdf
    • http://files.gracebiblefellowship.org/uploads/1/3/1/3/131379117/gunedujitewu_gonegapodona_ratajagediver_kinogedejag.pdf
    • https://cdn.shopify.com/s/files/1/0430/8015/5289/files/ielts_speaking_notes_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/becoming_jane_full_movie_in_hd.pdf
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/acuerdo_de_pars_sobre_cambio_climtico.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3450/files/hebrew_bible_genesis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4149/6981/files/acura_mdx_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/88282479655.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/bullying_in_north_american_schools.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/arizona_driving_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/liwafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/neopets_secret_lab.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/timunigisix.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/giviwawonuxomewotisokig.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8541/files/personal_characteristics_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0443/6351/4012/files/java_swing_jdbc_tutorial.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008632.bin
ba09a6de74cb464323d705cabc432df1b039da5a89752d845c408998ee681d7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8632 5648 bytes
font_01_sfnt_off00009951.bin
be318d421202b8a436c4e130e0825a50bc82fe1e06b25d7ff24aeeba5b941dea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9951 9688 bytes

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