Malicious PDF — malware analysis report

Static analysis result for SHA-256 69bf9ed1b13496bc…

MALICIOUS

PDF

49.0 KB Created: 2020-08-30 14:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e588fc79b1150ccb323e57d19136e495 SHA-1: ad39b20f0dff7bab6033b0711fa8d3bf7656f96f SHA-256: 69bf9ed1b13496bc2c76c5db04a27e64b9dce30f12aad144c3e872ec65cc5a0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with 16 external PDF links, one of which, https://ttraff.ru/wix?keyword=surf+fins+size+guide, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary purpose is to lure the user to this external resource. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or scam attempt.

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=surf+fins+size+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0fdb6d_4c468c68bbc648fe880b9d37cd95a052.pdf
    • https://static.usrfiles.com/ugd/ef7b09_63781827a55d40b59f6e690e21ad4c35.pdf
    • https://static.usrfiles.com/ugd/6f7357_b03bc2925a25405ca00e60eaffb778af.pdf
    • https://cdn.shopify.com/s/files/1/0458/6428/8409/files/gitevevodawawunazava.pdf
    • https://cdn.shopify.com/s/files/1/0458/5845/5705/files/educational_psychology_woolfolk_test_bank.pdf
    • https://cdn.shopify.com/s/files/1/0431/7767/2868/files/african_american_music_history.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/79917709638.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/5357939830.pdf
    • https://cdn.shopify.com/s/files/1/0439/5171/8558/files/92324699263.pdf
    • https://cdn.shopify.com/s/files/1/0427/5883/2294/files/bose_soundbar_universal_remote_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/4409/2566/files/zabofisoberi.pdf
    • https://static.usrfiles.com/ugd/43d598_345297722ced4c138accf789514fac28.pdf
    • https://static.usrfiles.com/ugd/1decf9_485f789168ac47eab8aee47a32ea6fc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fd757cb0e90442f996a960c16712c9d.pdf
    • https://static.usrfiles.com/ugd/9219f8_274846535944419383f28cf83a47ce23.pdf
    • https://static.usrfiles.com/ugd/b8c837_eae511e1d280401e82e865bf8488f0b6.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082c8.bin
0a2ed0d2819a8f6f06616e89ee82d36321b657556e19ab9b752983538d015ee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C8 4988 bytes
font_01_sfnt_off000093cf.bin
ed0f96b722241118397dfae48469c2f3e005b6c4ae8e1bc421d15df2df5b62cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93CF 10416 bytes

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