Malicious PDF — malware analysis report

Static analysis result for SHA-256 da425309a61c0b83…

MALICIOUS

PDF

41.2 KB Created: 2020-08-29 22:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97124cb0323445a7cd7e9ad57fbc63da SHA-1: 33c6381717dee26b93cfd98e6a397c332ac0a5d2 SHA-256: da425309a61c0b8399d75ecd0eaaf616dabe45563fb12492a03ae54bc5b436ac
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external links, suggesting a link farm. The primary malicious URL identified is `https://ttraff.cc/wix?keyword=earthworm+dissection+worksheet+answe`. This pattern is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/wix?keyword=earthworm+dissection+worksheet+answe
    • https://static.usrfiles.com/ugd/b8c837_6da0e753bd2a4a4aaa283a4db41a30f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a36e93acd664a8b90e6c3864820f749.pdf
    • https://static.usrfiles.com/ugd/760101_3df8c6e6fdbb4856a38ee103dc4f04ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_1974f7f331294c5daf86fb04cf682ea4.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d26706714284b4f9fb624b41232f538.pdf
    • https://cdn.shopify.com/s/files/1/0437/6585/8455/files/71002496098.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/rimidegu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/4629757757.pdf
    • https://cdn.shopify.com/s/files/1/0439/3051/7672/files/gamedugoviraniwuzubax.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/zelejivujoso.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/residuos_orgnicos_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/81918889950.pdf
    • https://cdn.shopify.com/s/files/1/0446/6468/4697/files/cambridge_igcse_physics_workbook_2nd_edition_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/48584288194.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43181801848.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/gba_emulator_free_for_windows.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000608c.bin
d09fbe42cbe11f0c8fc91d8f92256fcffb9caf595d7cee50bb97b35fd85e3ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608C 5260 bytes
font_01_sfnt_off00007261.bin
bc2c9813ad1037755992a605753c6923494993c0d0280183681f882a3643b3f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7261 10660 bytes

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