Malicious PDF — malware analysis report

Static analysis result for SHA-256 c830bd0d5bca22d7…

MALICIOUS

PDF

36.9 KB Created: 2020-08-14 04:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2d2c828eceae50207bdcf5859116cda SHA-1: 191491719d1191faeec81a50a73b22f9c45c68a3 SHA-256: c830bd0d5bca22d705d80d0fc45e43eaee89242e39bae6fc6ff51236f3d2df03
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to 'Bahubali 3 picture movie' and the malicious redirector URL, suggesting a lure to entice users to click through the link farm. The ML classifier strongly indicates maliciousness.

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/pify?keyword=bahubali+3+picture+movie
    • http://voforen.tickettoridegreatloop.com/uploads/1/3/2/7/132741555/1383544.pdf
    • http://files.terriermath.com/uploads/1/3/0/7/130776249/nuvatixa.pdf
    • http://wijed.preparepublications.org/uploads/1/3/0/9/130969723/3326428.pdf
    • http://files.cheshiredem.org/uploads/1/3/2/6/132682820/6151629.pdf
    • http://files.greenandhealthyschoolsacademy.org/uploads/1/3/2/8/132814155/gezilixekobijef.pdf
    • https://cdn.shopify.com/s/files/1/0436/2335/0434/files/xitaberinizo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/archeage_darkrunner_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/61180449324.pdf
    • https://cdn.shopify.com/s/files/1/0449/1975/0811/files/raladetonajobajewali.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/nejam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5606/2876/files/sixoremagibugux.pdf
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/bemat.pdf
    • https://cdn.shopify.com/s/files/1/0432/9639/1323/files/30315435899.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/bavatesesilunegosoxatipon.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/autocad_2020_shortcut_keys_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/lavupuxapupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/nirobo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1372/6631/files/ridolutepu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/asteraceae_family.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_off000050e8.bin
c12a287e817426af32da76e21ed51bde3a971a636fcaac90b3b8a54e8d104a83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50E8 5408 bytes
font_01_sfnt_off00006322.bin
5d8f551caa9ae2e3a76312de953a00debdb82ba656a2237163851f4b91fae51c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6322 10232 bytes

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