Malicious PDF — malware analysis report

Static analysis result for SHA-256 422802822db5250d…

MALICIOUS

PDF

45.2 KB Created: 2020-08-13 23:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ad64d94c180db8da22cc6f6900a73de SHA-1: 0959d7681a5a4c61e338a83763166d08c3859413 SHA-256: 422802822db5250d1cd003b8fa34af625e92e862eda5e178adc1a828d19dca3d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is part of a link farm designed to distribute malware. The document body, though obfuscated, contains text related to 'acs child care application pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. 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 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.com/pify?keyword=acs+child+care+application+pdf
    • http://files.stillcreekequestrian.org/uploads/1/3/1/8/131856380/gibubotilul.pdf
    • http://watopujuk.naturalfoodsofkearney.com/uploads/1/3/0/7/130738511/4056d990.pdf
    • http://files.isinglassriver.us/uploads/1/3/1/4/131407086/xetoraj.pdf
    • http://files.dancehampton.com/uploads/1/3/0/7/130739265/nivun-pegisuku-pevipa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4646/0830/files/kuxapalawixijizajijow.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/mawupibogidixixorin.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/vopogubolowexejojuwor.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1724/files/rivelunito.pdf
    • https://cdn.shopify.com/s/files/1/0439/7491/8302/files/xolukokufaminapevirezix.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/linux_server_administration_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/14380280374.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/nimitizomunedixijuxegom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/bitsat_syllabus_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8100/7255/files/viva_la_bam_full_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0440/7744/9366/files/pudevowalurepedofikok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006586.bin
f4abfa7b510b0484604d377b048b454adf18eb8d43d90434bf3fabb62a7b72dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6586 5020 bytes
font_01_sfnt_off0000767b.bin
3c537ad4c88c91528a60debf37f64c9c7c6dcdcadb64c96229e55a0cb590499f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x767B 10416 bytes
font_02_sfnt_off00009a1d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1D 4324 bytes

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