Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac2d1cf8898f54b…

MALICIOUS

PDF

40.9 KB Created: 2020-08-23 04:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 621410780c4fc5a9e857e767b603b0a5 SHA-1: b6646a862beeff2f0e1354dd31e0f3d7e647e18c SHA-256: 3ac2d1cf8898f54bb894737b91a0e34719a327386580bcb4ef5010453eda4b5a
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources, indicating a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=toefl+practice+test+pdf+vk'. The document body, though heavily obfuscated, contains text related to 'Toefl practice test pdf vk', suggesting a lure to trick users into clicking the malicious link. No scripts were extracted from this sample.

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=toefl+practice+test+pdf+vk
    • http://files.thebloodcrowstories.com/uploads/1/3/1/3/131383821/vukekeguriwemime.pdf
    • http://tuvefej.thomas-webb-arts.com/uploads/1/3/1/3/131398064/lonowuraxerure.pdf
    • http://talulom.nileshagemann.com/uploads/1/3/1/3/131398360/finegurobo-pokovomat.pdf
    • http://tiluwami.plateauvalleyanimalhospital.com/uploads/1/3/0/9/130969627/b893b.pdf
    • http://files.callanjames.co.nz/uploads/1/3/2/3/132302764/6b57c924ded.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5299/files/gojoraputazutesajovekasa.pdf
    • https://cdn.shopify.com/s/files/1/0453/9786/8712/files/58182517896.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/birizakidunupujudexi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/6517375494.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1996/files/25929629531.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/949986333.pdf
    • https://cdn.shopify.com/s/files/1/0438/3630/9666/files/7054776161.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/88617294922.pdf
    • https://cdn.shopify.com/s/files/1/0443/9562/6662/files/tijaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0743/4142/files/fisomigejo.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_off00005f65.bin
9a2b96b5b7dc17f0fc2e9fb8908a5cbd7d8bdd5675e2a260d0db8a98cbcc15f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F65 5224 bytes
font_01_sfnt_off0000713f.bin
da18a932a0c7ac5426828e453fd6fc0a2d9967718ab6b6f0224288f0407090ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x713F 11392 bytes

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