Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a56670d240d87d…

MALICIOUS

PDF

42.0 KB Created: 2020-09-12 14:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ede53fb53f5f374cf6001d6c3bb2a51 SHA-1: cee87fa72cd817c9e1aaed2c8dc4298bf85d1dca SHA-256: 44a56670d240d87dc991cc9a307a2f687b9fedf8ae0d2b712f2e3bde181e2afc
152 Risk Score

Malware Insights

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

The PDF document contains a lure text suggesting it is an application form for passport renewal. It embeds multiple links, with the primary one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure. The document body, though partially corrupted, contains the text 'Application form for passport renewal for minor' and the malicious URL, reinforcing the social engineering aspect.

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.me/wix?keyword=application+form+for+passport+renewal+for+minor
    • https://static.usrfiles.com/ugd/dcf311_f01a0829a56445b6b6c2282e89b7d3fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_870e0e68e57640e58ff529effbee9e36.pdf
    • https://static.usrfiles.com/ugd/b8c837_835c1276d6614d6c9616b40e197738c1.pdf
    • https://cdn.shopify.com/s/files/1/0436/7102/7865/files/d_d_5e_charmed.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/59065777879.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/79330851743.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0766/files/biomedical_waste_management_rules_2016_form_4.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7222/files/vpn_browser_android_2._3.pdf
    • https://static.usrfiles.com/ugd/43d598_16507a0f983b4dd79c1b6603b3c7b1d2.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_8a3214363d314c77b31fb2694ef84774.pdf
    • https://static.usrfiles.com/ugd/f6336d_31ceb472b12a426aaf096ac04c0992f6.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_off000064c6.bin
c6bb42f0b8719e718ab0465362cf5036092f1f3469893ea1438f03824e5e9b71
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C6 5240 bytes
font_01_sfnt_off00007697.bin
d93ca474239379a11f00b542c9dd31cf7553e84ce943a374b8aae0997e0309c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7697 10576 bytes