Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f19e4619260a41…

MALICIOUS

PDF

41.8 KB Created: 2020-07-14 17:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd4a40084d06a5b24b7135a353909cf3 SHA-1: 923f0631de34a3617b3ab9d14b1ad23685ca26e9 SHA-256: 43f19e4619260a4186fb0abbb333afdb29cf0951e823acdded7be29e810bef64
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic firing indicates a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links and the critical heuristic firings strongly suggest a malicious intent to redirect the user.

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/pify?keyword=ecology+and+environment+pdf
    • http://files.lizwalkerart.com/uploads/1/3/1/3/131380236/fakedu.pdf
    • http://files.matusnursingreview.com/uploads/1/3/2/6/132682681/4752324.pdf
    • http://files.patticudd.com/uploads/1/3/1/3/131381720/8266390.pdf
    • http://files.irentphilippines.com/uploads/1/3/1/8/131872273/131aaa5a5.pdf
    • http://files.angelasmilanich.com/uploads/1/3/0/7/130739313/6472ac500fe.pdf
    • http://files.liquidsunshinedesigns.net/uploads/1/3/1/6/131606644/6427307.pdf
    • https://jomuduxa.files.wordpress.com/2020/07/40850668408.pdf
    • https://tilufaxuto.files.wordpress.com/2020/07/75595845101.pdf
    • https://nedudiwu.files.wordpress.com/2020/06/34217881225.pdf
    • https://dinizadowav.files.wordpress.com/2020/07/tumanevibakakesuwinifen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mobisibat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65294746239.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8577/files/91644272142.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68906731860.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/penivigetikuxibudeguvesob.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/fobakikipusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/nixozusuf.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/
    • https://tilufaxuto.files.wordpress.com/2020/07/7559584510

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068a1.bin
7d43d9e20b28862eddc4f20d2a31ab0ef3ec888b0ffc870e23a08ff490043c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A1 5204 bytes
font_01_sfnt_off00007a46.bin
649381840f37408c079c7fa13aba64c83c7ae2ac66667133d7c485ab7c1ad8b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A46 9284 bytes

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