Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d80f192a4637f5…

MALICIOUS

PDF

41.6 KB Created: 2020-09-01 03:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6e176348ce3b669993deece22db99d7 SHA-1: 5392349c0bcd2245a5f99be2d60137f5ace59f9a SHA-256: f2d80f192a4637f5d6ab095e45c8980d31094afadd3269e23a237a7ddc69bde5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL. The presence of a large number of links suggests a link farm or SEO poisoning attempt to distribute 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.me/wix?keyword=context+clues+worksheets+with+multiple+choice
    • https://static.usrfiles.com/ugd/57c819_b8b2519c53834c59a90144d9ca566be7.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b25b80b365d4e4b9469ac05a284220d.pdf
    • https://static.usrfiles.com/ugd/f46427_384f03634c5846a9b3de55f563d9e4a8.pdf
    • https://static.usrfiles.com/ugd/f09a9d_02266d234c904d75ae1b1650051851ec.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2779/files/jowoxiguw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/13212307943.pdf
    • https://cdn.shopify.com/s/files/1/0459/9303/3887/files/the_pearl_john_steinbeck.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1638/files/zujozojifozofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/79367592781.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/bubuporanagimagulixavufe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9232/9116/files/perubizukefomariguwuxul.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/maxotedelaluj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4070/files/72815703009.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/nuburaxezedag.pdf
    • https://cdn.shopify.com/s/files/1/0438/6711/1584/files/29697866567.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0944/files/4534171372.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/ecological_sampling.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_off00006643.bin
f97d62c9bd4e193ebc74de7d252d4706ddd23cadbcc29e057974572fe425d5a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6643 5092 bytes
font_01_sfnt_off0000777e.bin
11393f04126c81d9b3702a1927c77895da91b2a5903764207d91179f6d5e2132
pdf-font-stream PDF embedded font (sfnt) at offset 0x777E 9904 bytes