Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3cb101b9924e03…

MALICIOUS

PDF

37.8 KB Created: 2020-07-23 14:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 930d07111c0ef5526669420365f067bd SHA-1: 8239255c2b01b14500ed6a2d0819c60ab92e3291 SHA-256: ba3cb101b9924e0342b7a1e1132eb852d1ace301769d76a84538f281bdb5a0ba
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. Additionally, PDF_SEO_LINK_FARM suggests the document is part of a link farm designed to manipulate search engine results. The embedded document body text, though heavily obfuscated, contains keywords related to 'Thanksgiving worksheets for kindergarten pdf', likely a lure to entice users to click the malicious link.

Heuristics 3

  • 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.
  • 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=thanksgiving+worksheets+for+kindergarten+pdf
    • http://files.cmhscheer.com/uploads/1/3/0/8/130814235/d1fe36e.pdf
    • http://files.lewisrawlinson.com/uploads/1/3/1/4/131437503/vavupozuwime.pdf
    • http://files.marycarolsullivanportfolio.com/uploads/1/3/1/8/131871658/mijad.pdf
    • http://files.sciencetheearth.com/uploads/1/3/1/4/131453198/nunekezabori_fotazinipexubod_kuvadofug_kewilaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37278413385.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7141/files/bewesenopadigoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/davogemukerorikifawuzisij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/73501859951.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/xodonupazinabukopefosopix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17232613021.pdf
    • https://cdn.shopify.com/s/files/1/0432/1155/4980/files/98305478620.pdf
    • https://cdn.shopify.com/s/files/1/0436/1981/1490/files/nowikes.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/juwufemomide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54729765263.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_off000058ab.bin
a38850155d3d781227675c8803e454c5d3a364404e9d5e43924dfd76f9fc663c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58AB 5224 bytes
font_01_sfnt_off00006a72.bin
3214f517fe2004245edc7bb95bd4610b42db478f061845ad6f52f9b56dd0989b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A72 9316 bytes

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