Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fc32149bfb8dae…

MALICIOUS

PDF

48.5 KB Created: 2020-08-29 02:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6ef4903dd035f67044e067d7fdf0c33 SHA-1: 6b88dd75a0d12cfff015cc2f56fb2d4e5cc260fb SHA-256: 39fc32149bfb8daebd9d049bf9abffe096afc2762ba89857f7b5282a78232588
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily garbled, contains the same URL and keywords related to 'td ameritrade thinkorswim platform', suggesting a phishing lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious URL embedded within the document.

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=td+ameritrade+thinkorswim+platform+d
    • https://static.usrfiles.com/ugd/b8c837_a9d43ee10ba949a798850b22f119515a.pdf
    • https://static.usrfiles.com/ugd/b8c837_63d74fb18a554f81931d84a70dbeb211.pdf
    • https://static.usrfiles.com/ugd/b8c837_760f2e9d855641ee95ef767bd6cd136c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fdb5595d6d84fc2bf094d40cd297c78.pdf
    • https://static.usrfiles.com/ugd/b8c837_87d310fa013448ffb91548e2e9a5dae6.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0479c7f127641e4ad3f201af1d2d2d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f676f4ff3d146058fef31fa5db7fc70.pdf
    • https://static.usrfiles.com/ugd/b8c837_2762b56172ef4ef8bb40c865dfa9f22b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a6f15a398ec4b8a84072937e05583d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_aadeb2e488894cd59f939b3042c55c3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d01a1d1f714c4a0d824308f66f920c4a.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8139/files/dewapazijerun.pdf
    • https://cdn.shopify.com/s/files/1/0454/3682/9854/files/battery_capacity_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0435/4280/6680/files/padavofobomur.pdf
    • https://cdn.shopify.com/s/files/1/0435/2075/3823/files/wogulesara.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b8.bin
c30a3da651a5e77843e59bbe76b042403023ec6aee9ef44dc5449840ae96af8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B8 5384 bytes
font_01_sfnt_off000075f7.bin
17523e55620feeada3c606e6084c7e062e4d0a585251f640f7bbacfc62f3a572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F7 10604 bytes
font_02_sfnt_off000099d9.bin
39d128d959b34161385fb56011e5eac0ff6504d7921359a984090a5c6c70f660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D9 17836 bytes

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