Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c35ce5628f9645…

MALICIOUS

PDF

40.3 KB Created: 2020-07-30 11:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f556e9d41a81d1e27a9b8535e1fbfa80 SHA-1: efaebe2ff535b9b4bb141e4149cc77d12c8f6855 SHA-256: e2c35ce5628f964535ddd41dd4fc055ee246aa369dd3b4356341eb461f2ff355
128 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'exercises pdf' and a download call-to-action, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content. The primary malicious IOC is the redirector URL.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=possessive+pronouns+english+exercises+pdf
    • http://files.markmirabello.com/uploads/1/3/0/7/130776656/naxisabozuragawibelo.pdf
    • http://files.sharedservicesct.com/uploads/1/3/1/3/131398475/nitak.pdf
    • http://files.danielkies.com/uploads/1/3/1/4/131407227/8690a5.pdf
    • http://files.danielkies.com/uploads/1/3/1/4/13140
    • https://cdn.shopify.com/s/files/1/0431/2409/7175/files/70162597989.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2106/files/tawurutolireletojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6273/0645/files/fiwovegarorufaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4638/8380/files/40673474915.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/gokapefimawaxove.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69143450337.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/93913843395.pdf
    • https://cdn.shopify.com/s/files/1/0432/4920/5405/files/loxapub.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/28219180519.pdf
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/6080225425.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/13810700913.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/padaluzulobowek.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/nobigukuwetaj.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_off0000604e.bin
589d07a19bbc2aa21ad00082a95e896864a9050669c1ec2d47569a7002b56496
pdf-font-stream PDF embedded font (sfnt) at offset 0x604E 5136 bytes
font_01_sfnt_off000071c3.bin
6c79f0de8f88129b8a49fc9c6f13499d5be53748f79b9defefea6ced825d48cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C3 10068 bytes