Malicious PDF — malware analysis report

Static analysis result for SHA-256 c255a3cb0b4aa642…

MALICIOUS

PDF

41.7 KB Created: 2020-08-09 09:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0178f1ba82a6a630daedcdea1d06028c SHA-1: 1be8ae45c0ca95aa45bd740cc4732c18585f6875 SHA-256: c255a3cb0b4aa64223a2d45b4e4edcce0d098c112fdb5eeecfaad2a624c7de6f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a lure to download further malicious content or redirect to phishing sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious redirector campaign.

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.ru/pify?keyword=free+model+airplane+plans+pdf
    • http://files.sybilgotsch.com/uploads/1/3/2/8/132814250/wamogatuf.pdf
    • http://files.psychometricdynamics.com/uploads/1/3/1/0/131069934/7695220.pdf
    • http://files.tryoungcrew144.com/uploads/1/3/1/4/131408100/e060a0eb719e.pdf
    • https://cdn.shopify.com/s/files/1/0436/6827/5353/files/nadomasag.pdf
    • https://cdn.shopify.com/s/files/1/0438/1461/7250/files/va_form_21-_8951.pdf
    • https://cdn.shopify.com/s/files/1/0433/0618/8955/files/10534272636.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/wepigenatunufapugetaravom.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/62975053520.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/yamaha_ydp_223.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/gujarat_university_bcom_sem_2_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/pabino.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/57982521143.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/84772673661.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2651/files/popuvazunugikiripa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9718/5701/files/fasizibanemuxeroje.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_off000064b7.bin
a074d1bbf5d3db58dbf14d688940a8d07e2d268ebfbd6ea62532a48cec2eca90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B7 5144 bytes
font_01_sfnt_off0000761b.bin
39229cd0a83a73fa49fafffee54f66db48519c3046bcce34c5f02467d309abc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761B 10592 bytes

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