Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2c3428bb72faad…

MALICIOUS

PDF

50.0 KB Created: 2020-08-30 21:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb2267d9eb0079f02197cbebba392663 SHA-1: d8e7306745bb9c95671bb37aeb5c062bba2b4590 SHA-256: 0b2c3428bb72faad21f7faa95dfd96bfed66c5ca516b392888fdb5996571c1ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, specifically for containing a redirector link and a large number of external links. The embedded URL https://ttraff.ru/wix?keyword=patrick+henry+speech+transcript is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and a list of other PDF links, suggesting a link farm or redirection scheme to distribute 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.ru/wix?keyword=patrick+henry+speech+transcript
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_35abd24c862d4319b7e29aed266c0f7d.pdf
    • https://static.usrfiles.com/ugd/1849a1_34dd735351ab4f339653614f69269c8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_757c09b529124f6594e648253cb78e9c.pdf
    • https://static.usrfiles.com/ugd/0789d5_36cbfe58c1614f0498d183d30c1f1d2f.pdf
    • https://static.usrfiles.com/ugd/277b62_3536a14fb1d645528db0b5142211ccda.pdf
    • https://static.usrfiles.com/ugd/5af86b_2e4beafd05414ec2b5f8df1d61293821.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb835e4e5b2b4850a9dce70c08322263.pdf
    • https://static.usrfiles.com/ugd/7ff653_bd49fe7103444507943e0af4f7282dd4.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_4e468dabac0743bfb321651b9f8ab531.pdf
    • https://static.usrfiles.com/ugd/b8c837_905df093d5004ff2890dfef871bb503e.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_off0000876b.bin
a52c3c3aed5cbf5aa54a6015953717ccc6c2048bde157301106ab3bfcc5ca73c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876B 5156 bytes
font_01_sfnt_off000098ee.bin
b69de8b108f7a40ce199886a476201fe65337b5cdd7a591d26b4958da8a13606		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98EE 10068 bytes

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