Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92a8d47fbad1689…

MALICIOUS

PDF

37.6 KB Created: 2020-09-02 01:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc5f439eec143fbe620f98fecf8436e9 SHA-1: 5b29ae68a473b105bbb701c740f81e6dce730e8c SHA-256: f92a8d47fbad1689dd75c75add4c3443ab275d4f6a29052450d5bc88076cedcb
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'free 3d shapes worksheets for 1st grade' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier also 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.club/wix?keyword=free+3d+shapes+worksheets+for+1st+grade
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/walivifedugolazigi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2749/files/xuxirozatabaxifi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/unimat_sl1000_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d5d493aee9340d6b6358ca4adbe12aa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/23989181625.pdf
    • https://cdn.shopify.com/s/files/1/0429/8938/7935/files/zobuzof.pdf
    • https://cdn.shopify.com/s/files/1/0434/0642/6275/files/dear_john_watch_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9571/files/chore_chart_template_for_toddlers.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/dufulememezex.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_off00005630.bin
ce7b15763814ecb43ee63889727e41c7e5c9df3874cc541678d858ad8d0cd5e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5630 5600 bytes
font_01_sfnt_off00006956.bin
e870515ce08c11a80d4a0ad0c20f9afae36dc83003526d4382f1bcfa8511dbd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6956 9524 bytes

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