Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b37f05c5ea8097…

MALICIOUS

PDF

50.3 KB Created: 2020-08-29 19:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbb41bebe49ae656a62ec625b9b8afa0 SHA-1: 7842cc856cf08b33fe61b90be5df083090904120 SHA-256: 51b37f05c5ea8097feb0c1f41f15be144e73c3783ede4aca62ee428f3787d905
152 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains the same URL, suggesting it is the primary lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links points to a link farm strategy.

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.cc/wix?keyword=descargar+el+pianista+latino+hd+utor
    • https://static.usrfiles.com/ugd/d162e3_a427279c31cb4401b441d27726a99356.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9362790c1ab4656b3979172d47a5cce.pdf
    • https://static.usrfiles.com/ugd/b8c837_58b5d391d825494a9a8833891b854cf2.pdf
    • https://cdn.shopify.com/s/files/1/0437/3748/1365/files/nixuxorurokegajivixe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9725/files/3d_maker_software.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/zivasadosakeredabo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4218/4095/files/15999545384.pdf
    • https://cdn.shopify.com/s/files/1/0437/0304/2216/files/berenice_edgar_allan_poe_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/the_pod_ween.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_cc62e553474a42b5ae43e3b5cb5accc8.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8fc5307b7c84764b06b437b970d8ec4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000750b.bin
e2478f2266e80aaaf01cb6090b17e7f5e39372a5e78b6e0e2645557f7af47853
pdf-font-stream PDF embedded font (sfnt) at offset 0x750B 5216 bytes
font_01_sfnt_off000086b8.bin
362b6d0152253fe58d8ec6157366eacef9020f7957596abcfa55ace09a723093
pdf-font-stream PDF embedded font (sfnt) at offset 0x86B8 11624 bytes
font_02_sfnt_off0000acc9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xACC9 4324 bytes