Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfb342e3149f9e7…

MALICIOUS

PDF

48.5 KB Created: 2020-08-15 02:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ba9296a11a5abdced166654beea22f SHA-1: 42f103d5a9942d79b081fef49ccad12b29f3bba9 SHA-256: acfb342e3149f9e712311e628764d1d5e7c653aa17f06ac678fbfd2f87e6dd15
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector. The document body, though malformed, suggests a lure related to an 'Angular 7 tutorial book PDF'. The primary malicious activity observed is the redirection to potentially harmful content via the embedded links.

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.cc/pify?keyword=angular+7+tutorial+book+pdf
    • http://files.eastwestmassagestudio.com/uploads/1/3/0/9/130969059/mipakaximixusituxib.pdf
    • http://vagesed.souland.org/uploads/1/3/1/3/131383790/dugenuwipuzasa-kevejapok-vijip-lapenine.pdf
    • http://nofuk.hygildsabc.com/uploads/1/3/1/8/131856584/2253544.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/lomavi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/39185829289.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/10410721190.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0983/files/totimepopamixonuket.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9525543421.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/so_gone_beat.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/child_care_leave_application.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/majusotogozarow.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_off00007dff.bin
c0ed3b963f1d85c192ffd11ada48b467663f97d64f19dacf92985661587c28d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFF 5304 bytes
font_01_sfnt_off00009021.bin
1742dc8a3a4ff2c435c0bf0e0760758dde69ef1c794f31487e1c3b4340563bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9021 11120 bytes

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