Malicious PDF — malware analysis report

Static analysis result for SHA-256 400cdce43e19e278…

MALICIOUS

PDF

47.6 KB Created: 2020-08-24 01:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2486e2ea94c3036ff18656ab5c63f67a SHA-1: b93846dc867c1f52ab922cd7676786bccf0d190b SHA-256: 400cdce43e19e278f76c1625b59dcb880f30f894cf37a45368d80b53e8be4c32
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, disguised as a template download. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the embedded URL confirm this redirection. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the visible lure text and the malicious URL.

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.com/pify?keyword=balanced+scorecard+strategy+map+template
    • http://files.aubreylloyds.com/uploads/1/3/2/8/132815015/19745.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/96317497406.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/turujeripuwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/83804505141.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/7272524765.pdf
    • https://cdn.shopify.com/s/files/1/0450/6628/9302/files/betugubifexagijubagovadi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/61384251661.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/48806817101.pdf
    • https://cdn.shopify.com/s/files/1/0437/1605/1112/files/46545779524.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/
    • https://cdn.shopify.com/s/files/1/0431/1393/911

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b98.bin
37187aa4b8c2093f1b1070e750783d727d5a272627c56feb8b5765ecf2c759dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B98 5544 bytes
font_01_sfnt_off00008e5e.bin
2aa2eaf335969ded1d07fe2466e755dc5ec2228e85784ee5a5be43cc48179bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5E 10284 bytes

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