Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6efb04eea29e90…

MALICIOUS

PDF

40.3 KB Created: 2020-08-26 01:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd6dc56c7bdbb9c34b16b82c2e63d763 SHA-1: 49867389ffd80688563c18dc58d1a29ee14a1b91 SHA-256: 8c6efb04eea29e903fc97a8a033a154f31115dcc0c7b1c5fc8e49da5f0ecc074
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'periodic table printable flash cards' and a URL pointing to a redirector. This suggests a social engineering attack aiming to direct users to malicious infrastructure.

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=periodic+table+printable+flash+cards
    • http://rizedusij.grubbweb.com/uploads/1/3/1/3/131398504/xukid_vagerezemolot_xomarewepozezen_bedezuziratujir.pdf
    • http://files.merelmarytheblog.com/uploads/1/3/1/4/131437770/befb0ac6b5ef.pdf
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/pimenule.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7333/files/gafabenij.pdf
    • https://cdn.shopify.com/s/files/1/0434/8438/1350/files/centrifugal_pump_working_principle.pdf
    • https://cdn.shopify.com/s/files/1/0464/6089/5384/files/assessment_and_evaluation_in_science_education.pdf
    • https://cdn.shopify.com/s/files/1/0431/6905/4886/files/widusorifajuvigumijemopof.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/90928369203.pdf
    • https://cdn.shopify.com/s/files/1/0463/4312/7202/files/tk_maxx_spain_valencia.pdf
    • https://cdn.shopify.com/s/files/1/0437/6949/5710/files/aventuras_fifth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3641/files/devububamarurimuxegulu.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_off00005f5d.bin
8dcc3da1b8db27f755cf7979310200b4ef071dbd2d7f2e9fe61f72f9fe0df5ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5D 5384 bytes
font_01_sfnt_off0000719b.bin
4b663dbd846a89f2a57407484181be8c8a736461c818aa1c0c85572713801827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719B 10352 bytes

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