Malicious PDF — malware analysis report

Static analysis result for SHA-256 b436e37a1fe4a6ea…

MALICIOUS

PDF

54.8 KB Created: 2020-09-06 14:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0ba91152286b3acc9d13adba9bc99bf SHA-1: 5ba1472bc3417bfcbd628a93a94db7a170b6a4fe SHA-256: b436e37a1fe4a6ea3dcb368a6982d24a699ea4867a6e504ef559b7222a766de4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.club/wix?keyword=cetoacidosis+diabetica+pdf+urgencias'. The document body itself is heavily obfuscated but appears to contain the same redirector URL and a list of other PDF links, suggesting a link farm designed to lead 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.club/wix?keyword=cetoacidosis+diabetica+pdf+urgencias
    • https://static.usrfiles.com/ugd/63d3ad_838c303d3c95460db5c9bb419d969ba5.pdf
    • https://static.usrfiles.com/ugd/fe83c3_70d12d10826f4237a69adab2d0d58d0d.pdf
    • https://static.usrfiles.com/ugd/8acad3_26dae8f28e6445199e4770dca0b7a2fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834bcfd68bd46e392f192ff386ad85c.pdf
    • https://cdn.shopify.com/s/files/1/0435/8520/8483/files/merlin_season_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/4634/5640/files/52623266909.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/audra_simpson_mohawk_interruptus.pdf
    • https://cdn.shopify.com/s/files/1/0466/2630/8261/files/ruramajoraniwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6172/2788/files/zapixebaxerumotejoto.pdf
    • https://static.usrfiles.com/ugd/5cf23b_2016c5c82bdc4067ad7a3e3a2a03bb75.pdf
    • https://static.usrfiles.com/ugd/963627_50b42971e5d04aa0a72a23e5ef5779ad.pdf
    • https://static.usrfiles.com/ugd/3b47cb_8dc23410fa55456dace638baa480e184.pdf
    • https://static.usrfiles.com/ugd/5bb01c_c771b32256c44b6f8f5e6580e2aa6b32.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c858a73eb3447a9b3c756bf73a9a67f.pdf
    • https://static.usrfiles.com/ugd/191a6d_9853d0f89ba147d3956570a52581826c.pdf
    • https://static.usrfiles.com/ugd/9a242c_bbb697bf55044b5c9403b7ff1da27600.pdf
    • https://static.usrfiles.com/ugd/b8c837_448da653320e434d9652c41205afd22a.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_off00007c39.bin
06332cdda788848cf5f7c6e9b627b3a4d4e76c0730bb022ed389f1d37b59345f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C39 3028 bytes
font_01_sfnt_off00008704.bin
f742a5e0ede54ac9ac9aaa86f5d9630214b2e4b15fe2da9acf82e5da032c2a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8704 5336 bytes
font_02_sfnt_off00009933.bin
8e0f092152a25a1ec83f7970176ac763810030f1ca2d438eb4a1e6331961f336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9933 17024 bytes

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