Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c66d46e8838f3bc…

MALICIOUS

PDF

39.3 KB Created: 2020-08-13 10:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef6498cb2d7c3eec8a0ecebfaae0616d SHA-1: 3a6a3a1cbd407d7ccdce94872e55ef102f91b0a3 SHA-256: 4c66d46e8838f3bc66e4c05fc9b1b74bbb3f905632d63e14f27184bbc36b91bb
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body presents a worksheet title, likely a lure to disguise the malicious intent. No scripts were extracted, but the presence of multiple embedded URLs, including one to a malicious redirector, strongly suggests this PDF is part of a campaign to redirect users to malicious sites.

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/wb?keyword=isobars%20and%20isotherms%20worksheet
    • http://bopigew.odoscholarship.org/uploads/1/3/1/1/131164250/686a8.pdf
    • http://bikevixir.itzaclip.com/uploads/1/3/1/0/131070493/6b41ccf8.pdf
    • http://files.puremotionwithmandy.com/uploads/1/3/0/7/130775144/9150043.pdf
    • https://cdn.shopify.com/s/files/1/0433/1094/0328/files/k-_lite_mega_codec_pack.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8436/files/67284881620.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2694/files/2725466479.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/nedaferemujasenatasoti.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6161/files/child_and_adolescent_health.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/pokatiketupadibikejojipov.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/39102928426.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/degeduvinajifuberopomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74195332560.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2767/files/60379155684.pdf
    • https://cdn.shopify.com/s/files/1/0437/0546/7035/files/68169968965.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/94938376676.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005018.bin
e22cae0730e245670dee7c49bcf24db6bc2b9de2a229e8256cb2a43bf7f09026		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5018 5052 bytes
font_01_sfnt_off00006118.bin
a44dbfc4376d9c678cf8d76cc00ed31bbe1205b57ae01aa90892d7cd6f67b9c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 9780 bytes
font_02_sfnt_off00008287.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8287 4324 bytes

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