Malicious PDF — malware analysis report

Static analysis result for SHA-256 49da864e8d2ce4c1…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 08:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9846c66a6a142690a859549a9fdc04d SHA-1: 8c69e7de21bdcc0707d4a43d843728109d3354e5 SHA-256: 49da864e8d2ce4c1e68ffafb3af923ea1cdc17ef152c3fc74f017682c98690c7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'Dayan1kl1l1k nelere bal1d1r'. The presence of numerous links suggests a link farm or phishing attempt to direct users to 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=dayan%2525C4%2525B1kl%2525C4%2525B1l%2525C4%2525B1k+nelere+ba%2525C4%25259Fl%2525C4%2525B1d%2525C4%2525B1r
    • https://cdn.shopify.com/s/files/1/0432/0965/4436/files/86773082953.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/42478147795.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/nogedijejiluf.pdf
    • https://cdn.shopify.com/s/files/1/0435/7970/3451/files/96867327764.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfe136bcdc9e448dbf4c3a112f7ebd87.pdf
    • https://static.usrfiles.com/ugd/9dda13_31b53f7ca5a14ebbab6fda8529042649.pdf
    • https://static.usrfiles.com/ugd/63d3ad_ace91a1526a44c699300de6490131220.pdf
    • https://static.usrfiles.com/ugd/b8c837_67660d60ef52465fa2f1dc49f206c923.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1195/files/vuliruwigadijoxil.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/attachment_report_writing.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/85615189928.pdf
    • https://cdn.shopify.com/s/files/1/0429/7991/7987/files/memas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdf
    • https://cdn.shopify.com/s/files/1/0439/9353/0526/files/chevy_traverse_2012_manual.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_off00005a2e.bin
e53f6f54826671d7b0056507b6bf0887434dbc76f8976b13b76ba547362a8884
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2E 5208 bytes
font_01_sfnt_off00006bf8.bin
46ccbd4c7b6d51d8486c459e28b8ace641e9733964b3ad28a421773e10eec842
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF8 14788 bytes