Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be5d83a3f5cebb7…

MALICIOUS

PDF

41.3 KB Created: 2020-08-05 12:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c23821a1540e21ff3a5b49b7f550d8a7 SHA-1: 7adb05419e5c3195edb30be378f56e59bc999ade SHA-256: 8be5d83a3f5cebb7c9e325566facfacca0f8227256941cd38f3bbe6ce8e1b4dd
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the string 'Ending sounds worksheets pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=ending+sounds+worksheets+pdf
    • http://files.terrellga.com/uploads/1/3/0/8/130874031/vusivamew-wufapobiwuk.pdf
    • http://files.umndisabilitybenefits.com/uploads/1/3/1/6/131636954/3b7f02875dc.pdf
    • http://files.skyshedpodpa.com/uploads/1/3/0/8/130814774/wudege.pdf
    • http://files.netherlandsandcoloniesrevenues.com/uploads/1/3/0/8/130874620/sunofunonowisi-vipakisizup-tovokonirak.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/28590016900.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/83383280687.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/20002588022.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/75510793225.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/94955615311.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/dufuzaxonedirololirika.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8918/files/star_trek_legacy_mods.pdf
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/30211493082.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/zaxoloru.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/takeuchi_tb240_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/4609/9349/files/84386921503.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_off00006405.bin
5900b61e4bef115c76ee1d38d4e409928ca7e2f03b7609a2a1f766b8216acb54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6405 5172 bytes
font_01_sfnt_off000075b8.bin
dbd9c41725a6dede40a1019f5f0accd2bb0b7f739cdad5cb2b09d745d7f7db2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B8 10136 bytes

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