Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc228f5935cf539…

MALICIOUS

PDF

48.8 KB Created: 2020-08-29 09:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bf2aaeb8ead99ef1b96a3db268a0e26 SHA-1: 0a7b6461f8348a252f7fdc70634aaeaf985b541b SHA-256: bfc228f5935cf539ef04f5cba7f52030623cf87329c2b8788d2c9f1259d5c2db
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=train+a+runs+back+and+forth+on+an+east-west+section+of+railroad+track.+train+a%2527s+velocity'. Another critical heuristic identified a PDF link farm, suggesting a broad attempt at SEO poisoning or traffic generation. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily corrupted, contains fragments of the URL and text related to trains and velocity, likely a lure.

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/wix?keyword=train+a+runs+back+and+forth+on+an+east-west+section+of+railroad+track.+train+a%2527s+velocity
    • https://static.usrfiles.com/ugd/b8c837_73da8329b14d4ff7b43e116734a409de.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa054a5fcd264abc984fea4c92328c5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb52067d17a94301bc4f6831a2a45ebe.pdf
    • https://static.usrfiles.com/ugd/b8c837_21f5a7f45d4245dbbc013ae55784ae18.pdf
    • https://static.usrfiles.com/ugd/b8c837_57ede5627bd64971b4976289694babe6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbecc9a1d58c46e9b45e70e6f34fd5c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f6ae57c1da1416c80abebba4f00ea5c.pdf
    • https://cdn.shopify.com/s/files/1/0434/1619/1138/files/amazing_adventures_rpg.pdf
    • https://cdn.shopify.com/s/files/1/0434/1900/9173/files/stem_capstone_project.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/bizuzisenimivi.pdf
    • https://static.usrfiles.com/ugd/b8c837_3085bd9acd8b4fec8b03ec193094e59e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f244d413efbd4490a8a22d3cdf270720.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0c90cec36e9447080397cc238479b82.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebf02657339b4e02872284978779b162.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_off00007a7e.bin
71eb959e6d3387fdc169d038d7f6b691348ea1b3e9369d34a05be9e1b08c9b2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7E 5616 bytes
font_01_sfnt_off00008db8.bin
cbd5675754b27b4706c699bd532bec31e521d784a0d78e7f963b61439af85cbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB8 10904 bytes