Malicious PDF — malware analysis report

Static analysis result for SHA-256 144591a2e338a362…

MALICIOUS

PDF

45.5 KB Created: 2020-07-10 11:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d944316c3071a41cf7d9986f6fc238a SHA-1: 1c6d068152e699fed5d8e9917a2c57d7a1edf465 SHA-256: 144591a2e338a36295887de69939f700785369aa6dbf496bea231cf7fc010dbd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, identified as a link farm, directing users to potentially malicious websites. The ML classifier strongly flagged this PDF as malicious, and one of the embedded URLs is associated with known malicious redirector infrastructure. The document's content appears to be a lure, possibly for SEO spam or to distribute further malware.

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/wb?keyword=uv%20spectrophotometer%20calibration%20pdf
    • http://files.firewiseconsultants.com/uploads/1/3/1/3/131380467/8300795.pdf
    • http://files.coxautoroadtrip.org/uploads/1/3/0/8/130873893/bepugugidalega.pdf
    • http://files.lashedbyred.com/uploads/1/3/0/7/130775520/vabuzazito.pdf
    • http://files.beachtownrattan.com/uploads/1/3/1/8/131871786/bab71b83868b4fd.pdf
    • http://files.daisysrdc.com/uploads/1/3/0/8/130814279/sixarur.pdf
    • http://files.arelationshipcounselingcenter.com/uploads/1/3/0/7/130738887/58e9bbfb9ce10d5.pdf
    • http://files.qcc.nyc/uploads/1/3/1/4/131453526/236589.pdf
    • http://files.artsmartmanila.com/uploads/1/3/1/8/131856041/9477478.pdf
    • http://files.unclutteredessentialoils.com/uploads/1/3/2/6/132683088/kimatom-nomesofa.pdf
    • http://files.lindyjames-christenson.com/uploads/1/3/1/3/131379612/3953267.pdf
    • http://files.angelicastrologymagic.com/uploads/1/3/1/3/131383959/6162fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gidurum.files.wordpress.com/2020/07/66954528583.pdf
    • https://riwuvot.files.wordpress.com/2020/07/79492515775.pdf
    • https://darewubuj.files.wordpress.com/2020/06/gubibowemivoj.pdf
    • https://sazemod.files.wordpress.com/2020/07/19519115101.pdf
    • https://pitimonuzoxa.files.wordpress.com/2020/06/wiruverevavulesikezasug.pdf
    • https://gutelum.files.wordpress.com/2020/06/86124667545.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75320426607.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lujodegiduwidixerilaji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69901941500.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wabodenerevugibew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34888362351.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_off00007222.bin
80e8492bae9f4b0210ef07548b0e8f1fe27eb161057e8b8e1486d2baf1e0343b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7222 5376 bytes
font_01_sfnt_off00008440.bin
2c7413fa3072a97e59f5f3e84f97084533987bdb447d4efbbdfc87622a46637f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8440 10720 bytes

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