Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9dbca98addf8cc…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 13:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 368ede2a5d0c6bde3251c056231c7c4f SHA-1: 55e3552143ff2c549627264cc3e6779f381631ec SHA-256: 0d9dbca98addf8ccc09a40b15338c2d3c172f5970e829f8c525d65e5e9b1ced1
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a worksheet, suggesting a lure. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm used for SEO poisoning or distributing further malicious content.

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/wix?keyword=adding+and+subtracting+integers+number+line+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/pioneer_avh_x5500bhs_parking_brake_bypass.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/nozesudaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3279/files/ganesh_atharvashirsha_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0439/0679/3627/files/93078401313.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/22003083029.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8887/files/84312638608.pdf
    • https://static.usrfiles.com/ugd/2f8cea_d061676d11fd4894b264173af9aaa4c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_e76da3b2619f43ffb4ec599c2c8f5948.pdf
    • https://static.usrfiles.com/ugd/d54300_e24184b76a8048e0b9640573f2f60cff.pdf
    • https://static.usrfiles.com/ugd/af0aa9_53473694a04b4c8d988c40f52851f098.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_c212aba9724f4f0ba29346fb0c4a7ec3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3960b0e47166470a835d2421d50ee26f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f503b5c295b648b19252197c58d0108e.pdf
    • https://static.usrfiles.com/ugd/b8c837_48ef981763f14e7cb887befc3eb6581d.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_off000063f8.bin
4ef745cebd2a04a8b7004b995a6030d364e59f3cb6d67dd4757f0498cc44afc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x63F8 5640 bytes
font_01_sfnt_off0000770b.bin
719e2a9eb32f3130aa375f82d43fa68afb959ad8048ef411dfb8aeff7b3919c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x770B 10740 bytes