Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd15cd574ef033f…

MALICIOUS

PDF

43.8 KB Created: 2020-08-25 10:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de1c5824d8a4aff4756bd145d593e810 SHA-1: c3c61fd7facca2a32e6eed66b4e7832d646d22c4 SHA-256: 6fd15cd574ef033fa1264bda3a6afadcb5dbd081bfb3ed36be82ddf048d0893e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the structure and heuristics suggest an attempt to drive traffic to potentially harmful content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=yuki+no+hana+piano+sheet
    • http://voduvol.simply-diabetes.com/uploads/1/3/0/9/130969754/4533825.pdf
    • http://files.clinicaespacosaudebeleza.net/uploads/1/3/1/1/131163872/d00290233b6.pdf
    • http://kekipez.macclesfieldpoolleague.com/uploads/1/3/1/4/131453416/xaxekivegutagevoxol.pdf
    • http://riwip.dcfhub.com/uploads/1/3/1/8/131856158/puvesiz.pdf
    • http://tefunez.janabergevin.com/uploads/1/3/1/4/131409508/jivoxesumova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0464/9756/2776/files/walmart_cotton_flannel_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/94483569693.pdf
    • https://cdn.shopify.com/s/files/1/0428/2597/3916/files/zuvomupiremibubemu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/vojanolisowugogigitojuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52657742202.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/80343614778.pdf
    • https://cdn.shopify.com/s/files/1/0433/2116/3941/files/gist_say_n_on_spotify.pdf
    • https://cdn.shopify.com/s/files/1/0434/8218/5893/files/96407364416.pdf
    • https://cdn.shopify.com/s/files/1/0435/8373/3915/files/6905482633.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/goginilivupizeworubidufug.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4199/files/jelodedovetexapij.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053e4.bin
b4a39cd7870c6461ca52b958427afde2c0637d509e21e327745722cdb3ee78ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E4 3212 bytes
font_01_sfnt_off00005f30.bin
03d36b9a5857920826310f210c4f19190198b0c7f5f4c9ee574da2de551c41fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F30 4804 bytes
font_02_sfnt_off00006f7d.bin
b8ed84c1f1426ed0f4653f905386ec36d12a5dc1874f2b2201082217bc5d9136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7D 15928 bytes

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