Malicious PDF — malware analysis report

Static analysis result for SHA-256 133a330fd28ec65a…

MALICIOUS

PDF

99.5 KB Created: 2020-08-30 12:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ab3a45e96b0c610037d658eaf974bf1 SHA-1: f5db5fc0266c7cf6ecad4e10940e3f5edeb2c6df SHA-256: 133a330fd28ec65aa2811bf840da8d0e811caadd3f003bac561aaf9f73401e0c
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure for users to click the link, likely to download a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=12th+std+tamil+guide+pdf++2019
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0461/9013/3406/files/suara_pancingan_anis_kembang_macet.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5809/files/a_star_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67062005494.pdf
    • https://cdn.shopify.com/s/files/1/0432/9983/1966/files/bismillah_rahman_rahim_in_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/20974298140.pdf
    • https://cdn.shopify.com/s/files/1/0440/6283/4853/files/sidamonogapabufukosixum.pdf
    • https://cdn.shopify.com/s/files/1/0434/9604/6752/files/70744463464.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/understanding_business_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/kenmore_washer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/26033538849.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0d15a98e73a46568002f219140aba0e.pdf
    • https://static.usrfiles.com/ugd/74a852_f66fd0fa7f2f452c82a7cbf0a74ea0b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebaebab9db8e494c85fdf9b5bd3c9800.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e02755ea7f64cb2ba3cd4a7f15fa134.pdf
    • https://static.usrfiles.com/ugd/9b33c5_53f9527044da442680db5ae6df126442.pdf
    • https://static.usrfiles.com/ugd/b8c837_74465752283444388758f57b94ea23c3.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011173.bin
3322d4eeaa4cb51583bdba5130bbb588fa58542b047f4c2190595efcaf127a72		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11173 20468 bytes
font_00_sfnt_off0000fe05.bin
cd0a607362d02335c96e09cc2cff06dc67dc22d5a456fdde8ed678b2bf77997a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 5748 bytes
font_02_sfnt_off00013d82.bin
de5ab0c60cb3c322fa4b5ac3b76f3b2153b3606e7c880b2624fb1b6257133dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D82 1944 bytes
font_03_sfnt_off000146cb.bin
62d60f30f16d47d4cf7eccfc02e7c21d5e4e909b41eeec7fc207444b9a5d5e26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146CB 14336 bytes
font_04_sfnt_off0001739f.bin
2b78a5bc9544195928a7cac8b24729f07c6b29c8edfc58e91fc0426a4c047fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1739F 2932 bytes

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