Malicious PDF — malware analysis report

Static analysis result for SHA-256 39113415c87326ff…

MALICIOUS

PDF

40.8 KB Created: 2020-08-29 02:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e4bea979395616ffd2e37f2c16a8920 SHA-1: d6399e6a05b200a996bee5d476ae4c2e6c706a9c SHA-256: 39113415c87326fff34559a677bffd3b7de48fe836f1753a544b0acdd2e7206f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to other PDFs hosted on Shopify. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this document. The embedded document body text, though heavily obfuscated, contains the malicious URL and appears to be a lure for a book download.

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=jack+daniels+running+formula+book+pdf
    • https://cdn.shopify.com/s/files/1/0436/5923/1385/files/woperobabikul.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/lavexubuseruwumefojusib.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/lixabo.pdf
    • https://cdn.shopify.com/s/files/1/0439/9883/8942/files/4245241676.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/pawopedugupo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/90398248062.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/gupuwozidodagusowas.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9436/files/at_kendini_diskolara_indir_boxca.pdf
    • https://cdn.shopify.com/s/files/1/0433/7490/3452/files/pezuvufimanodofatexajekib.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d3a9aaa7b394840a10067bfcc32ede7.pdf
    • https://static.usrfiles.com/ugd/b8c837_61f6670e4eb74da582f67b161bb55618.pdf
    • https://static.usrfiles.com/ugd/b8c837_f451828e6a5e4f59b1a49fcadbce9e02.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060c2.bin
00076af941144c8fcf8384e47465eb57a66e18f6e015cd8329c0b2f0c87f58a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C2 5668 bytes
font_01_sfnt_off000073f0.bin
0fc2f1925af92930e28eaf5fa85e70cf755db3b463e1fad267c551c352c1ab49
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F0 10136 bytes