Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5979f66b15cb53d…

MALICIOUS

PDF

54.2 KB Created: 2020-10-31 22:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc7d31c1fb19a1196fb034ae6ed1d084 SHA-1: 1be86c203043d5121646bf52841ee19bede8fd07 SHA-256: e5979f66b15cb53db7b853dec40424f3d9b90547cecfe05b75dd89ecf790097e
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search results, directing users to a malicious redirector at https://ttraff.club/123?keyword=how+to+remove+background+color+in+word+mac. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs, many pointing to benign Shopify or S3 buckets, suggests a tactic to obscure the malicious link among many others. No scripts were extracted, but the primary attack vector is the redirection to a potentially harmful site.

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/123?keyword=how+to+remove+background+color+in+word+mac
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/Copyright
    • http://www.typoland.com/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/3985/7563/files/optimus_prime_voice_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0505/4890/0013/files/68317319859.pdf
    • https://cdn.shopify.com/s/files/1/0484/8546/6267/files/73291501027.pdf
    • https://cdn.shopify.com/s/files/1/0435/7364/1379/files/49891350190.pdf
    • https://s3.amazonaws.com/fajonubinomeder/liliduvuxowifipuleza.pdf
    • https://s3.amazonaws.com/tiduro/murijiwodawipak.pdf
    • https://cdn.shopify.com/s/files/1/0268/7136/5819/files/kenwood_middle_school_in_clarksville_tennessee.pdf
    • https://s3.amazonaws.com/kokesatodixon/checklist_for_starting_a_nonprofit_organization_in_maryland.pdf
    • https://cdn.shopify.com/s/files/1/0507/9026/9122/files/womifexivokimezi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3131/files/cherrypickers_guide_6th_edition.pdf
    • https://s3.amazonaws.com/zuxadol/autosketch_tutorial.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ab.bin
de6aacb5a55f55b98bf3ae384f96a51051c900e5a59c241f5198d539ce1a3af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AB 6168 bytes
font_01_sfnt_off0000704b.bin
d5ef0e93b62fc7c72af1d2609fe2c57c8eff3dcb44b1f0556a5041ba0ab75daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704B 5280 bytes
font_02_sfnt_off00008239.bin
77b747185589e8fb5c6b295f628875e2fccdc11722d0ead4925944fcb845557f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8239 10944 bytes
font_03_sfnt_off0000a7a8.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A8 16312 bytes
font_04_sfnt_off0000bd34.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD34 4324 bytes

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