Malicious PDF — malware analysis report

Static analysis result for SHA-256 8270bb21a3ed23df…

MALICIOUS

PDF

41.2 KB Created: 2020-09-06 09:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c73c2be03d127f2255daa8fe2611372 SHA-1: bd218f620257d63cb3c67c7bd6be9b47f0fc167f SHA-256: 8270bb21a3ed23df2edf0bda1c01ae04885c064f25ac143152a234eb2929a343
154 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to a redirector service. The document body, though heavily obfuscated, contains the URL https://ttraff.link/wix?keyword=simple+fraction+addition+worksheets, which is flagged as a malicious redirector. The presence of numerous PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.link/wix?keyword=simple+fraction+addition+worksheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/wavogebepaxurir.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/wopovoxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7587/0613/files/74759999344.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/8763637694.pdf
    • https://cdn.shopify.com/s/files/1/0437/8876/3298/files/entanglement_theory.pdf
    • https://static.usrfiles.com/ugd/760101_bea9f88aa42c4ca7b7cf3a1e9306dacd.pdf
    • https://static.usrfiles.com/ugd/ddb60a_35e7da9601354c5dbd935c9f759a8cb1.pdf
    • https://static.usrfiles.com/ugd/49488e_0d480014313c4b17aef2607b8a9bf8ff.pdf
    • https://static.usrfiles.com/ugd/57c819_5de178602bde4dbab854f46ce0365e53.pdf
    • https://static.usrfiles.com/ugd/158fb9_f76a3846ca7d409bb60839b8cb7abf6a.pdf
    • https://static.usrfiles.com/ugd/bf57b5_55e34024e3824c6d82be104ca3f24691.pdf
    • https://static.usrfiles.com/ugd/b3bc21_1feb42d3833e46e3934c02e85d2c2dcf.pdf
    • https://static.usrfiles.com/ugd/6cf392_6021b3560cb8433499d5200b6d60ae5f.pdf
    • https://static.usrfiles.com/ugd/c57cae_ec1fe71caef640c4a89dfdaae76970f8.pdf
    • https://static.usrfiles.com/ugd/e3325f_acf4d32f1efe48a1aa1b1a37519b955b.pdf
    • https://static.usrfiles.com/ugd/9ec29b_7640b713ad2343d1a0af38f0dbb5f0a0.pdf
    • https://static.usrfiles.com/ugd/63d3ad_733ec2a973c3448c93c480a40957fe9f.pdf
    • https://static.usrfiles.com/ugd/e3325f_5190b1b22ac24654ae9c15c741d00c9f.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_off0000616f.bin
10c8918219bace2728b5b5730674d68f0359aac844b0eed511a7793751343c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616F 5656 bytes
font_01_sfnt_off00007496.bin
4d1747261d4671116210b1d44e15ccf70b6ff20c1b242dbdbacd0339170672a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7496 10364 bytes

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