Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b39f33b085c2ae…

MALICIOUS

PDF

43.5 KB Created: 2020-07-10 02:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd74ab36d18bc19f37c098ebf6f552eb SHA-1: dfab2e90cc9bdb2fdae3a9ef048b221401b14012 SHA-256: d2b39f33b085c2ae7bc44809c8b4d5096a7e8ef6ed06bfbb27e5118b6b3a39bb
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded URLs, forming a link farm designed to redirect users to malicious content. The primary heuristic firings indicate that the PDF links to known malicious redirector infrastructure and functions as a link farm. The document body, while containing obfuscated text, includes the target URL and other links that are part of this redirection scheme. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wb?keyword=liste%20vainqueur%20ligue%20des%20champions%20pdf
    • http://files.chairelectoral.com/uploads/1/3/1/4/131406295/489ed29b8.pdf
    • http://files.merrifieldseminar.com/uploads/1/3/2/7/132710655/7749287.pdf
    • http://files.stemacademyband.com/uploads/1/3/2/6/132695851/fatejukovereja.pdf
    • http://files.aplfore.org/uploads/1/3/2/7/132741045/1bc38727ef5850.pdf
    • http://files.hatha-house.com/uploads/1/3/1/3/131383802/jetez.pdf
    • http://files.smgengr.com/uploads/1/3/0/7/130775275/40613e874c1.pdf
    • http://files.whatissparta.com/uploads/1/3/1/6/131606854/wijota_lomuto_bexerugowejon.pdf
    • https://mapuluvunav.files.wordpress.com/2020/07/wowukopo.pdf
    • https://megiloginuw383940643.files.wordpress.com/2020/06/bosoxubodev.pdf
    • https://matufajolib.files.wordpress.com/2020/07/bozarawaforibo.pdf
    • https://fisolivapi.files.wordpress.com/2020/06/66280637003.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80023348890.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46676539889.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/todexarim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.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_off00006a2e.bin
ad96a367238a20a98354d8023873e68fa392d448cf3c5543330aebb05c06803f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2E 5580 bytes
font_01_sfnt_off00007cee.bin
339f0817cd726aba112ad9d9d3f454fc01d7cb477655a30e4bc1640eaa434618		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEE 10308 bytes

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