Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8cb267e1bafbd4…

MALICIOUS

PDF

36.8 KB Created: 2020-08-06 21:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61193a872dd5b69f0fbc8e012abf6cab SHA-1: cc7b88e01cb912cb9b1f4c4257d67862164aa49c SHA-256: 6a8cb267e1bafbd40ab84faaaa327b26225040ab10472cb9cff61fb95dadfbd3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external resources. One of the primary links, https://ttraff.cc/pify?keyword=ascending+and+descending+order+worksheets+for+grade+5+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, appears to be an attempt to disguise the malicious intent with a seemingly educational topic. 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.cc/pify?keyword=ascending+and+descending+order+worksheets+for+grade+5+pdf
    • http://files.nyacklibrary.org/uploads/1/3/1/6/131636845/popotikozekiraj-pizuko.pdf
    • http://files.asthewoodturnzne.net/uploads/1/3/0/9/130969037/18022.pdf
    • http://files.800logiccor.com/uploads/1/3/1/3/131379343/zanadumawag-zasiku.pdf
    • http://files.wayfinderlifecoaching.com/uploads/1/3/1/3/131381021/lukom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/4209448585.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3028/files/71513701159.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/77070235886.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/77047970928.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/18932999421.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/wapofevosavufazukevogaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/7430/3640/files/how_to_convert_to_csv.pdf
    • https://cdn.shopify.com/s/files/1/0440/8341/3142/files/s10_v8_swap.pdf
    • https://cdn.shopify.com/s/files/1/0432/1941/9291/files/35961994713.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/98256761935.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_off00005081.bin
8f96da96317add4dd5122d50d87cba0063f4161d979f44582abf070af9054d90
pdf-font-stream PDF embedded font (sfnt) at offset 0x5081 5656 bytes
font_01_sfnt_off000063dc.bin
0811bbe310223688aa0f16f790690ea6fd13106845444cc286636b61e616b4ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x63DC 9912 bytes