Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b3982a44c892d7…

MALICIOUS

PDF

69.9 KB Created: 2020-08-13 00:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ead3e2f16e3df9589bf2fe55719a34a8 SHA-1: a928155af74f74ca35717d584051763d224f0dfb SHA-256: 30b3982a44c892d7072112282d600fbd30f0e91666aeb06be588519da0a0b22d
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.cc/wb?keyword=hemostasis%20pdf%20indonesia', is flagged as a malicious redirector. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to external malicious content.

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.cc/wb?keyword=hemostasis%20pdf%20indonesia
    • http://files.mischievouslibrarian.com/uploads/1/3/0/7/130738799/vatanoja-dodelurepevos.pdf
    • http://files.tatjanakusic.net/uploads/1/3/2/6/132681513/loxepaje.pdf
    • http://bekil.hcei.org/uploads/1/3/1/3/131379578/zoxupur-luxup-fibifek.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9605/files/nuwanonetafawoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/baroque_architecture_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/3450/1535/files/introduction_to_probability_and_statistics_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0435/6499/0632/files/70957885173.pdf
    • https://cdn.shopify.com/s/files/1/0432/0074/1531/files/42980908467.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/rasopuvurapanedejuzepad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lamafavikunidamekisuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4711/files/modern_auditing_and_assurance_services_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/nefudafigovivafiwadog.pdf
    • https://cdn.shopify.com/s/files/1/0437/8371/7015/files/32263043598.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/87005748509.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/malayalam_kavitha_aswamedham_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/20475048175.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_off0000d605.bin
8642b653ce0ff0c878e02eb4c608854f0faaa68351c397db90c3a10cf687cb19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 5020 bytes
font_01_sfnt_off0000e70e.bin
4b4e9b316177aadae2df342ac12f6b6ec87cac3e901a883f037add4aeed89848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 10340 bytes

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