Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad5d18d3f0beae4…

MALICIOUS

PDF

50.0 KB Created: 2020-09-18 05:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4633ba76d37fe3825794d13f87a325f1 SHA-1: b0a2605731c39ce3a09d621fc9c11b12913cd034 SHA-256: 1ad5d18d3f0beae4b073dd98bf94e75a86e42370c2bf7351bfe22526665a1847
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'worksheet answer key' and includes the malicious URL. This indicates a phishing attempt to redirect users to malicious infrastructure.

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.me/wix?keyword=volume+by+water+displacement+worksheet+answer+key+pdf
    • http://ratogob.fcuccjefferson.org/uploads/1/3/0/7/130740169/7782539.pdf
    • http://jagewisu.razmaths.com/uploads/1/3/2/7/132740435/311241.pdf
    • http://repew.jflesher.net/uploads/1/3/2/6/132695615/bowijaz.pdf
    • http://files.red-lotus-consulting.com/uploads/1/3/0/8/130813757/6373fb.pdf
    • http://files.vinoandvernici.com/uploads/1/3/0/7/130739212/6162816.pdf
    • http://files.lisayountpottery.com/uploads/1/3/1/4/131437886/d53877ce7.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9624/files/burularolib.pdf
    • https://cdn.shopify.com/s/files/1/0430/1111/3123/files/92243459745.pdf
    • https://cdn.shopify.com/s/files/1/0434/1664/9890/files/java_se_tutorial_oracle.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/kumolabutef.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/inon_zur_leliana_s_song.pdf
    • https://cdn.shopify.com/s/files/1/0461/8918/3129/files/tozeperasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/73832343500.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/25512659477.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_off00007762.bin
03dde088126f7d8abe60ad94a83acfa5a5d10c4314670b5608cc0ba898b30625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7762 5640 bytes
font_01_sfnt_off00008a74.bin
c0c69e3d66de091f837cf8884f3731f98204e194b64cb866598b7459a1851d6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A74 10068 bytes
font_02_sfnt_off0000acd3.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACD3 4324 bytes

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