Malicious PDF — malware analysis report

Static analysis result for SHA-256 672992f00efef426…

MALICIOUS

PDF

33.8 KB Created: 2020-09-03 07:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbd546a2f6c0729ed335d07938797ca5 SHA-1: 56ff96c87d78cafdcbbd0180ab9c0e29af4fb591 SHA-256: 672992f00efef42672c5ac7c7b447295badd698fea7049f833c0416ec274033d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains multiple URLs, including the primary malicious redirector. The presence of numerous embedded links, identified as a 'PDF_SEO_LINK_FARM', suggests an attempt to drive traffic to potentially harmful sites, possibly for phishing or malware distribution.

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=b+v+ramana+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/6d59ab_7a74f2ce317e4e63b9f406efcedda7ce.pdf
    • https://static.usrfiles.com/ugd/217d68_277e64a180ee4f16bc3d7f6225003810.pdf
    • https://static.usrfiles.com/ugd/f63f29_b28e123a954b42fbaac87bb2439577fd.pdf
    • https://static.usrfiles.com/ugd/e42ee3_51f006d3956f4555b2b5b96e5464194b.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_b685b2923198453ea0eac2e37b10ca3f.pdf
    • https://static.usrfiles.com/ugd/0d2fda_25054f067b1944e5a8b79040fd83e859.pdf
    • https://static.usrfiles.com/ugd/22bf55_9971634438db48c0a5d337f50cc0d28a.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_fe9e70e6fb214fc3a66152fe6c8be4d0.pdf
    • https://static.usrfiles.com/ugd/086daf_75fc1dd3b0d24210a2a89c983e788ffa.pdf
    • https://static.usrfiles.com/ugd/8ab72e_43632739b64440f3a1f275174d449253.pdf
    • https://static.usrfiles.com/ugd/a3b54b_55c1e4135e1b4ebbb98bd0d36e7597a7.pdf
    • https://static.usrfiles.com/ugd/a107db_4b0c3ad169834a448e74e3fb5840cc3d.pdf
    • https://static.usrfiles.com/ugd/05e3ad_6e78ad3080e64725b2d9a4ce690e963f.pdf
    • https://static.usrfiles.com/ugd/3eed2b_01f5c22075374e9c8e39d51b3fce1514.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_off00004730.bin
28283d0bad0f8674067de133f28a1ebbe306bd3d582bf1663ed92cbeef9ce588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4730 5084 bytes
font_01_sfnt_off00005872.bin
a38296ed3a8271a64fe56dd8cf99fab0692e33b3f6bd19f0f4ae72477a144932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5872 10220 bytes

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