Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d8cd3145be5561…

MALICIOUS

PDF

59.5 KB Created: 2020-08-11 16:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54fc10e06fa32fa748952844e7b5b921 SHA-1: eacc7a280f5f575d3814be63f09458be21bb34c7 SHA-256: 10d8cd3145be5561f2fda21c16a7a47e359a9adbb8e7be53749fdc9366e7cd70
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One prominent link, https://ttraff.ru/pify?keyword=distribui%25C3%25A7%25C3%25A3o+binomial+pdf, is identified as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or redirection campaign.

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/pify?keyword=distribui%25C3%25A7%25C3%25A3o+binomial+pdf
    • http://files.southsidecigars.com/uploads/1/3/2/6/132695741/8b9dd5eab8465a.pdf
    • http://files.blackhillspediatrics.com/uploads/1/3/1/4/131407284/5b391e0b55.pdf
    • http://files.janeandjohnqpublic.com/uploads/1/3/1/8/131872054/xapogilebibapuzu.pdf
    • http://files.acreditleap.com/uploads/1/3/0/7/130739155/43ba6bd6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/zimifawupasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3013/files/billy_goats_gruff_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/5980/5350/files/noxaberusuvixomanun.pdf
    • https://cdn.shopify.com/s/files/1/0440/3727/5813/files/51188227276.pdf
    • https://cdn.shopify.com/s/files/1/0437/3748/1365/files/21582718302.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0898/files/ecologia_y_salud_ambiental.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3653/files/biography_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/65358170966.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/7996/files/vunudibax.pdf
    • https://cdn.shopify.com/s/files/1/0438/0481/9613/files/find_height_of_binary_tree_c.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008472.bin
7fae3fb6d79735605fa27715b563eebc46d23083f8446b2558262cd4975bfc75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8472 5824 bytes
font_01_sfnt_off00009785.bin
28780e3ad82c79640792b7ccf73b0c13dc921d232ab3d27198931e9afaa39d35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9785 15344 bytes
font_02_sfnt_off0000c77f.bin
fa1facf076e4a48be005db9f39458375851233ac297d7933f311f52c541001a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC77F 16756 bytes

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