Malicious PDF — malware analysis report

Static analysis result for SHA-256 190fd88c16ae20ae…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 04:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f4e4d32cbb6e45ec5477d88ff5cbdf3 SHA-1: a71f6fd30b1ddf0f72e671e8417fad42292f32a0 SHA-256: 190fd88c16ae20ae9cd635b82c50968304659423adb5090519f8edb511d6cbd3
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 platforms. One of these links, 'https://ttraff.ru/wix?keyword=w3c+que+es', is identified as a malicious redirector. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly benign documents. 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.ru/wix?keyword=w3c+que+es
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0458/5658/7929/files/nevimubunuwolel.pdf
    • https://cdn.shopify.com/s/files/1/0430/0596/8537/files/3903211299.pdf
    • https://cdn.shopify.com/s/files/1/0450/5698/3192/files/27460012276.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/lifugasanabujo.pdf
    • https://static.usrfiles.com/ugd/c63dba_988338854d7b4c048301004d50f1adf7.pdf
    • https://static.usrfiles.com/ugd/b8c837_642773ac15ce4b6585d5d3bfa5f34a20.pdf
    • https://static.usrfiles.com/ugd/67e251_8da71921b55a4514888ff59e20d49f63.pdf
    • https://static.usrfiles.com/ugd/49be48_153ceade98414cd18d99757212cbc0fb.pdf
    • https://cdn.shopify.com/s/files/1/0432/1119/4525/files/79020832314.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/7414847538.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5852/files/dalowu.pdf
    • https://static.usrfiles.com/ugd/3b7182_cb01458f943b47718951374323fc9f00.pdf
    • https://static.usrfiles.com/ugd/88a84f_03dfe46aaeb543e1a7e4ed7e88144181.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_6b8ecb5bcf844633919c6adf629e739c.pdf
    • https://static.usrfiles.com/ugd/b42fd6_36c01509c05040dfbf78931799160e10.pdf
    • https://static.usrfiles.com/ugd/b8c837_64ff54eb1c6c43e0a006ccc99c6f5e33.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_off000065e5.bin
6025d18997ee2d99ceda98c63a0470051b162c89518af4ae3910c9f35f5ec590
pdf-font-stream PDF embedded font (sfnt) at offset 0x65E5 4760 bytes
font_01_sfnt_off0000763e.bin
536b82c2afeb0447d0588ec48b9143f49ed5fcb3349d7d893e524e5a4690d010
pdf-font-stream PDF embedded font (sfnt) at offset 0x763E 10188 bytes