Malicious PDF — malware analysis report

Static analysis result for SHA-256 6824ce99508ca8c2…

MALICIOUS

PDF

44.6 KB Created: 2020-08-30 21:39:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3af86308e1d9599e5db22c289a3f187 SHA-1: c40fabef02352b67ad792c815cf3399f185a8762 SHA-256: 6824ce99508ca8c2ce5a426b80001a73e81204edf611d332577c63407cb58a95
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body, though heavily obfuscated, contains the same URL and references educational material, suggesting a lure. The presence of numerous external PDF links further supports the classification as a link farm, often used for SEO manipulation or to distribute 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.ru/wix?keyword=simple+past+tense+worksheets+pdf+grade+4
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/ae15ca_58731af51bf746d8a3049cca86759841.pdf
    • https://static.usrfiles.com/ugd/ce14f3_45d3d81dea934db7b91b52e55a6dc56b.pdf
    • https://static.usrfiles.com/ugd/8de238_7167d3c1d41f473e8aa753f80120332b.pdf
    • https://cdn.shopify.com/s/files/1/0450/0937/1286/files/otite_sreuse_traitement.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7268/files/pimobimobu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5879/7471/files/pdf_books_free_download_in_urdu_islamic.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7073/files/sawakisejinoxenukuk.pdf
    • https://static.usrfiles.com/ugd/b8c837_e195907eaac446be838b39e13d16cf2f.pdf
    • https://static.usrfiles.com/ugd/857e61_b843fb6b754348bebfdb608eb74092b7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0450/3171/9070/files/categories_of_food_additives.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/bixamizagezuner.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d55.bin
6343b6b8876c16477a62e2d5bcda42dd04b771a04f199b548753ee6d80f7c390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D55 5588 bytes
font_01_sfnt_off00006032.bin
083ad6e39fb13df274aebda59c9df207eccd6ccb6d326cc3f8caa3ef7509c2aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6032 10140 bytes
font_02_sfnt_off000082cb.bin
df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CB 16060 bytes
font_03_sfnt_off00009761.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9761 4324 bytes

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