Malicious PDF — malware analysis report

Static analysis result for SHA-256 1100d479d8ab3202…

MALICIOUS

PDF

42.4 KB Created: 2020-08-04 07:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5a56c2f243902157fe9f0bd3708e236 SHA-1: 0addf0b9c188f7f2a8d9b02bcb2754f7b7e80285 SHA-256: 1100d479d8ab3202654380c73d538bf2c01cf46484fdb669f3c20a00f73a9d09
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links, 'https://ttraff.com/pify?keyword=tipo+de+estudio+descriptivo+cuantitativo+pdf', is identified as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

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=tipo+de+estudio+descriptivo+cuantitativo+pdf
    • http://files.trojanpathways.com/uploads/1/3/2/6/132683330/mukigaxoduranifa.pdf
    • http://files.lamsperspective.com/uploads/1/3/2/8/132814071/rusan.pdf
    • http://files.clemsongammaphi.com/uploads/1/3/1/3/131379059/kololoza.pdf
    • http://files.paulspipes.com/uploads/1/3/0/7/130776206/tegivo_motevelamemume_lidewexasuwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kovutuku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9521/2697/files/lupawufotupuzitufad.pdf
    • https://cdn.shopify.com/s/files/1/0436/0057/6669/files/38989125493.pdf
    • https://cdn.shopify.com/s/files/1/0429/9289/4115/files/48752567817.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/finavelonitew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/68385273317.pdf
    • https://cdn.shopify.com/s/files/1/0433/7087/2986/files/44683833351.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/43282173922.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8929/files/irreplaceable_beyonce_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/wajituwuvin.pdf
    • https://cdn.shopify.com/s/files/1/0440/6516/1366/files/51286405826.pdf
    • https://cdn.shopify.com/s/files/1/0432/5061/4429/files/87087905099.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7916/files/left_riemann_sum_calculator.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_off00006660.bin
3369b5de0b49a0feca9eb88f8caabbc297319af2df0f52cdafe80fec5773e998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6660 5128 bytes
font_01_sfnt_off000077ea.bin
0aa7683c3aee40c616d4bd84193cc0ff9e4798f148244449e29aac7a6a8fd476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77EA 10788 bytes

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