Malicious PDF — malware analysis report

Static analysis result for SHA-256 185b32cea404490f…

MALICIOUS

PDF

40.2 KB Created: 2020-08-12 02:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e7bc7540e38cb1ac506193c0d5dc9d6 SHA-1: 098c5393027b615c2ac2ef094553d3be4ab1b77a SHA-256: 185b32cea404490f14be7cd6a7d088dfdbcf01ae0574cb678e268bc0f4ffadbb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO poisoning scheme, aiming to lure users to malicious sites.

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=animation+meaning+pdf
    • http://files.perturbmusic.studio/uploads/1/3/1/4/131453560/9ec9b8707.pdf
    • http://demos.southkeyscentrum.com/uploads/1/3/1/4/131408738/4850007.pdf
    • http://files.cksdrumshop.com/uploads/1/3/1/8/131856277/1b6b948a39.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/52924368521.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/bitinek.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/58899801589.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/87711333122.pdf
    • https://cdn.shopify.com/s/files/1/0437/2257/1930/files/60694498523.pdf
    • https://cdn.shopify.com/s/files/1/0437/5481/5640/files/35896450792.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7423/files/bunga_belimbing_wuluh.pdf
    • https://cdn.shopify.com/s/files/1/0436/0231/3373/files/pajigozuxusivejiwubufigem.pdf
    • https://cdn.shopify.com/s/files/1/0434/5144/9496/files/soxemepuxixavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/streamline_english_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/download_photoshop_cs5_full_crack.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/16266697946.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/27940239705.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_off0000615c.bin
e0ced36da2a65a6fa996c7f4bb6126715efed56eedd60f48fdaf3261e86c7937
pdf-font-stream PDF embedded font (sfnt) at offset 0x615C 5044 bytes
font_01_sfnt_off00007273.bin
6dbda76809b56774ba97847dec30fa82837b809fff2d8aa2e1a4871cbaef9490
pdf-font-stream PDF embedded font (sfnt) at offset 0x7273 9756 bytes