Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d07407ec12ebdb…

MALICIOUS

PDF

50.2 KB Created: 2020-08-10 11:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29de50bacd1beb279f7e2dc34981a134 SHA-1: 8b9f7c8eec0c59aa625a3aaeedc6529199ae8e80 SHA-256: e5d07407ec12ebdbcb111beb566dfc6d54e84248aab9ad2f8e26779c62b60a12
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and heuristics indicate it contains a link farm with a URL pointing to a known malicious redirector. The document body is heavily obfuscated, but the presence of the malicious redirector URL suggests an attempt to lure the user to a harmful website. The PDF also contains numerous links to Shopify-hosted PDFs, likely part of a SEO spam campaign.

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=actitud+definicion+psicologia+pdf
    • http://jusibuzim.artoutofdakota.com/uploads/1/3/0/7/130738720/1345235.pdf
    • http://files.fortykes.net/uploads/1/3/1/4/131437953/rawuzijupi_mewejowaratu_dupodoxija_vigipub.pdf
    • http://files.theplatinumbutton.com/uploads/1/3/1/3/131398091/wonukalabafuz-wivuvarepez-powategaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/27042888174.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/braun_silk_epil_9_manual_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/49_country_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/xogoweju.pdf
    • https://cdn.shopify.com/s/files/1/0429/1218/6531/files/rumeretu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2152/5407/files/barcelona_map_metro.pdf
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/comment_joindre_plusieurs_ensemble.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/komejipokavonunebew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwotowomezi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/bigor.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_off000083b5.bin
7a7ae0d7d8f67dbed526bd298db852fcf8bb25e51aeee341850f5ee684236ac5
pdf-font-stream PDF embedded font (sfnt) at offset 0x83B5 5216 bytes
font_01_sfnt_off00009596.bin
ff47a853ec0ad05dea20dff2e352e4d547a18d56f102b16fe9227696c6d17167
pdf-font-stream PDF embedded font (sfnt) at offset 0x9596 11400 bytes