Malicious PDF — malware analysis report

Static analysis result for SHA-256 b901b1f80174a690…

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 11:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cfa26aaf509fd753694628585761e4b SHA-1: 883f6a8cfb7d431adb8eaafa79388d00013d17a4 SHA-256: b901b1f80174a690c0251c6e2e069f8855a4aef6ce6aa58a31aea83c134ebfc0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is used in conjunction with a lure to download a Flickr video. The document body, though heavily obfuscated, also contains this URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting a broader campaign to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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.ru/wix?keyword=download+flickr+video
    • https://static.usrfiles.com/ugd/b8c837_0e7d1d0853c747a1ad25edcac3ef4490.pdf
    • https://static.usrfiles.com/ugd/ea78e0_e8c437642ee6429c8e64aad7e087ebf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_774efeb839ad48a9a590285939142e34.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0a1acd69a744bdc87d22a4cbe0bff06.pdf
    • https://static.usrfiles.com/ugd/b8c837_85610b545a39410487a610b3e7dfc8c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d77506e3517540b19d940f67c4ba78e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_1351572647e1432a8131b2b08e7c330b.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7712/files/braindumps_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3093/files/ruteniki.pdf
    • https://cdn.shopify.com/s/files/1/0435/6656/3487/files/78435993000.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/67027773764.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/42857621444.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/febazebasoxigiraxoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/23829770904.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/47470810740.pdf
    • https://cdn.shopify.com/s/files/1/0434/5770/8193/files/bible_history_free_download.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_off00006454.bin
f58cdef6136acc34ae4a43147043014d0d1028e0537fbe3c4c1f8b098086ae4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6454 5052 bytes
font_01_sfnt_off000075b1.bin
cdc6a24f8317f25181b99aaf542eb04d59b1407a8462146b21cfc58ce7d4fba1
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B1 10128 bytes