Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8bb1b893ff5699…

MALICIOUS

PDF

42.5 KB Created: 2020-08-14 03:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15df248cc5a3b17048acb6e78b27d796 SHA-1: 50dc9486f4ce5aaf8076339b80f17b187dcdf44e SHA-256: 3f8bb1b893ff5699ed522c4870be28251f88839953d7f19fe9d0c8f222595891
128 Risk Score

Malware Insights

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

The PDF file contains a link farm and a malicious redirector URL, indicating a phishing or social engineering attempt. The document body, though heavily obfuscated, contains the text 'Jelly bean worksheets kindergarten' and the malicious URL, suggesting a lure to download potentially harmful content. The presence of a visual download button heuristic further supports this. The primary malicious IOC is the redirector URL.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=jelly+bean+worksheets+kindergarten
    • http://bawomiw.thechildrensvoice.net/uploads/1/3/0/9/130969744/4126806.pdf
    • http://kanaz.conservationculturomics.com/uploads/1/3/1/6/131606407/fagifov-bavaku.pdf
    • http://files.aramgershuni.com/uploads/1/3/1/3/131379894/a01dd8731a.pdf
    • http://files.fccira.org/uploads/1/3/1/4/131408502/mabusanutog_vajineruzudifun_xonefuxumex.pdf
    • http://files.danielwisniewskiactor.com/uploads/1/3/1/3/131380107/4b290bd9f0.pdf
    • https://cdn.shopify.com/s/files/1/0438/2588/9442/files/leladiso.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7384/files/advanced_excel_practice_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/7703814550.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/22550408828.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6959/files/99502649726.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/dusakuvupe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/tatavafuvunogufepixizan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6220/6357/files/aramaic_interlinear_new_testament.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000510e.bin
18eb8d5795e651588f6f21dd285cfe84b5ededccb3c64ec2e5adae5a833e5916
pdf-font-stream PDF embedded font (sfnt) at offset 0x510E 5472 bytes
font_01_sfnt_off000063b5.bin
eca22dcc3c56b0e912614c71e77d9b08e7cf2479a9b750fd02f9de064d6a8864
pdf-font-stream PDF embedded font (sfnt) at offset 0x63B5 10644 bytes
font_02_sfnt_off0000877f.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x877F 16312 bytes