Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c2bf5e479932cc…

MALICIOUS

PDF

40.8 KB Created: 2020-08-14 21:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9978b6e2dec6df231087fc471ad8cca5 SHA-1: 40dc25aaccd23248037eb629d5db6f60d94d96f7 SHA-256: a4c2bf5e479932ccfafc202cdee851769ac40667aeae7cad1ed38aba39427d28
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing users to a URL related to car transmission reliability. This link is likely a lure to a malicious site. The document also contains a large number of embedded links, many pointing to Shopify domains, suggesting an attempt to blend malicious links with benign ones. No scripts were extracted, but the presence of the malicious redirector and the ML classification indicate a high likelihood of malicious intent.

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.com/wb?keyword=automatic%20vs%20manual%20transmission%20reliability
    • http://files.nicolainickson.com/uploads/1/3/1/3/131378942/297f233a35e2ec.pdf
    • http://xixoxefox.cs.ogdcl-nthp.com/uploads/1/3/1/4/131438474/dulufoweron.pdf
    • http://files.focusingmoments.com/uploads/1/3/1/6/131606335/e42a799182.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6314/files/sri_lalitha_sahasranamam_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/budget_2020_19_pakistan_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5430/1338/files/putogidetudifivezebenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/xeniborujitumemedokavot.pdf
    • https://cdn.shopify.com/s/files/1/0445/4249/2836/files/streaming_data_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/27131768476.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/73510810404.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/wasokoxiramojubepaxanido.pdf
    • https://cdn.shopify.com/s/files/1/0432/2145/0914/files/geragebitatusisugoguze.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/lotelaketanedelek.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/arkansas_corporation_franchise_tax_report_2018.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/wunapig.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_off000061e1.bin
ebc8892051cb43235db40aa9206fb29d1feb394d2c7eb1529e98bf1dd1d90e0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x61E1 5236 bytes
font_01_sfnt_off0000739f.bin
b87ed7b094e794cefc62e355bdb2a1afc9219d423821d0e6588883bc5b3f1aee
pdf-font-stream PDF embedded font (sfnt) at offset 0x739F 10128 bytes