Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ae73aef028e661…

MALICIOUS

PDF

37.6 KB Created: 2020-08-30 11:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22c273755e50eeef671c37e6ab7c6a8c SHA-1: 223b056bf609d21abdfcaaa6086402fe28ad99bc SHA-256: 51ae73aef028e661b8de77238cb00a2f87b942ca6820c5e57c3da72d42dcfca1
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The embedded URL 'https://ttraff.ru/wix?keyword=nitya+pooja+vidhanam+in+telugu' is the primary indicator of malicious intent. The document body, though heavily obfuscated, also contains this URL, reinforcing its presence. The ML classifier also strongly flagged this PDF as malicious.

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=nitya+pooja+vidhanam+in+telugu
    • https://static.usrfiles.com/ugd/b8c837_363c9afafdc34a44a13dc7e47a33af43.pdf
    • https://static.usrfiles.com/ugd/87a178_5d3dc8e41a6646eebb17627415672f2f.pdf
    • https://static.usrfiles.com/ugd/18f527_298fc8da4460460c9d0548db460be61f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/zitizuzomowoja.pdf
    • https://cdn.shopify.com/s/files/1/0440/1384/6693/files/21335697630.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/21706501576.pdf
    • https://static.usrfiles.com/ugd/affaa6_f068569b296d4be98c75c293b0db2b37.pdf
    • https://static.usrfiles.com/ugd/10e3af_4c8c5d19be454d33ae88f5947826bc60.pdf
    • https://static.usrfiles.com/ugd/8cbfce_7ccef3600ed94b8abd5a330b263e2cb8.pdf
    • https://static.usrfiles.com/ugd/d1c05f_8076fe90194840c182ff46166f01c328.pdf
    • https://static.usrfiles.com/ugd/5e8de6_cfcefeced8e34e99a65d63f931e35510.pdf
    • https://static.usrfiles.com/ugd/b8c837_95984a5f735046ce9fcdf2916bf839b3.pdf
    • https://static.usrfiles.com/ugd/5ecadc_31d1ecdb451e4abea53dcc022bf38395.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_off00005253.bin
beac17e786692b64bc1873d4457d9c2a505360d3bb90f50f5ec04f1a00101bc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5253 5308 bytes
font_01_sfnt_off00006449.bin
cf768bb324ade13714307c8e1c5333b8b4dbeb5656e3e83c7ca9d4daf85514d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6449 10660 bytes