Malicious PDF — malware analysis report

Static analysis result for SHA-256 4583f73802560c9c…

MALICIOUS

PDF

43.1 KB Created: 2020-08-30 02:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1efdea6b51e54748fc2086d65019a00 SHA-1: 39c92f5666c7fc34d05b513c8d6600edf1091e3c SHA-256: 4583f73802560c9c5e64c6cf2fc7e4ff2b0f66dd8d69f7941b1f506fdff2b059
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily corrupted, also contains this URL, suggesting it's the primary lure. The presence of numerous other links, many pointing to Shopify domains, indicates a potential link farm or SEO poisoning attempt to mask the malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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=ark+gewicht+erh%25C3%25B6hen
    • https://static.usrfiles.com/ugd/5ad03d_a8ffe389cd63419f85d4e56743778bbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_15efeb427726487784f231101b4e8c43.pdf
    • https://static.usrfiles.com/ugd/97634b_193f823078e04e3a98c15875cb611d23.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/cambridge_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/leralodidaxagemin.pdf
    • https://cdn.shopify.com/s/files/1/0431/7668/9825/files/lewarumevuwimonotox.pdf
    • https://cdn.shopify.com/s/files/1/0454/7146/5630/files/handwriting_worksheets_cursive_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0437/5999/2990/files/61821336113.pdf
    • https://cdn.shopify.com/s/files/1/0462/5619/3687/files/sagenadoduronarewupipuku.pdf
    • https://cdn.shopify.com/s/files/1/0432/0614/8255/files/14328135755.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/50050172569.pdf
    • https://static.usrfiles.com/ugd/c7a620_260147a3360f48aa9ebea368765ace47.pdf
    • https://static.usrfiles.com/ugd/b8c837_253cc0ff78e042fdb1ed281ec2f3713b.pdf
    • https://static.usrfiles.com/ugd/b8c837_63f930eeefe54607b2a09fbba739838f.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_off000061ea.bin
4d882f02b63b6f53fcf24d2bc0420258f03455c3b6fb1f0f4deb5c437796d5ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x61EA 4924 bytes
font_01_sfnt_off00007277.bin
be7472de45c492c419f3cefc062a7de0836a5c124664454a10379097164df69f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7277 14360 bytes