Malicious PDF — malware analysis report

Static analysis result for SHA-256 71382eeb38eac9a0…

MALICIOUS

PDF

41.7 KB Created: 2020-07-10 06:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67975d5bca1a894fb2a4dbe6cafa7cc9 SHA-1: da6cefdb69f880c049f0386adc6ca8828869edcb SHA-256: 71382eeb38eac9a0fb147fedc3c00908e647e83c73c9c4bd2ed4b46b521dfc14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is designed as a link farm, directing users to numerous external PDF files, including a known malicious redirector at 'https://ttraff.com/wb?keyword=possessive%20pronouns%20exercises%20with%20pictures%20pdf'. The extensive list of linked PDFs suggests an attempt to manipulate search engine results or distribute malicious content through a network of seemingly unrelated documents. The ML classifier 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/wb?keyword=possessive%20pronouns%20exercises%20with%20pictures%20pdf
    • http://files.gsadaptivesports.org/uploads/1/3/1/0/131070116/e7d9cb82b99f.pdf
    • http://files.kimkirch.com/uploads/1/3/1/8/131856331/7941606.pdf
    • http://files.cantorcarl.com/uploads/1/3/0/7/130739362/nakinokuw_sudinanudakaje_xivewi.pdf
    • http://files.nadinedarling.com/uploads/1/3/0/8/130873830/rivitafumof.pdf
    • http://files.conquergoodcreative.com/uploads/1/3/0/9/130969830/sixiromadu-taxarane.pdf
    • http://files.haywardfitnessfanatics.com/uploads/1/3/0/8/130874413/dugen.pdf
    • http://files.clackamasbible.org/uploads/1/3/1/3/131378952/woworofadid.pdf
    • http://files.annishealinggarden.com.au/uploads/1/3/0/7/130776864/kuxafixogudaruwuje.pdf
    • http://files.jameskallembach.com/uploads/1/3/1/6/131606335/wujupisosimawela.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ludiwam.files.wordpress.com/2020/07/mowij.pdf
    • https://gajekijofe.files.wordpress.com/2020/07/dukoka.pdf
    • https://jejarulexiki.files.wordpress.com/2020/06/filabikavebixigo.pdf
    • https://jepupugewaka.files.wordpress.com/2020/06/sumenutadoniweges.pdf
    • https://kebufif.files.wordpress.com/2020/07/xitagolemubometugan.pdf
    • https://sawotisokawu.files.wordpress.com/2020/07/75990936002.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niwaragevutaxesidep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000648b.bin
a109bd479b90cedc00841d105117b41aa8ac175b901d667f89654863f4528b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648B 5104 bytes
font_01_sfnt_off000075fb.bin
98139b2ae1bb746b9a3aa5474601b42dc327a318608c64b7881b1b459d055a0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FB 10404 bytes

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