Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e5e61480ab2d53…

MALICIOUS

PDF

45.5 KB Created: 2020-08-06 20:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6bbeec6399cf7a1c6d60bef6112e33d SHA-1: 3b637d302a03e2704b7640ffd0567c17f5100dd9 SHA-256: 81e5e61480ab2d53e8c0d47a7423ff9e4f0bf6ce40b5e062d58f570c91944f86
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical link identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to this malicious infrastructure. This suggests the document is designed to trick users into visiting a malicious site, likely for further exploitation or credential harvesting.

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/wb?keyword=small%20business%20budget%20template%20pdf
    • http://files.sightplussound.com/uploads/1/3/1/4/131407655/8645430.pdf
    • http://files.copperhousecoffee.com/uploads/1/3/1/8/131856376/3033811.pdf
    • http://files.unostradivariperlagente.com/uploads/1/3/2/7/132740997/1275996.pdf
    • http://files.forkedontherhode.com/uploads/1/3/1/4/131452735/xivepixegitor.pdf
    • http://files.beccarothfeld.com/uploads/1/3/1/4/131407552/rogelerufev_zokas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/6759/6191/files/binonaxiwobuzod.pdf
    • https://cdn.shopify.com/s/files/1/0446/1376/3235/files/small_combine.pdf
    • https://cdn.shopify.com/s/files/1/0450/4364/6614/files/america_maps.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/alternate_angles_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9118/2243/files/are_banks_closed_on_veterans_day_2016.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/14317730442.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/kanomuxifopogujax.pdf
    • https://cdn.shopify.com/s/files/1/0429/2499/8819/files/pdf_reader_kindle_alternative.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/juxilutivoraxob.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/jemasaxofik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006860.bin
0f20723e6a5efec0c90f926372dd13f2eb960e6eb0ff6e4bb6f312bf6c09d318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6860 5280 bytes
font_01_sfnt_off00007a33.bin
4907ff7a8e57c0a735e1212b281188376782aab133b92035a4b99a075fce81a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A33 9596 bytes
font_02_sfnt_off00009b17.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B17 4324 bytes

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