Malicious PDF — malware analysis report

Static analysis result for SHA-256 9725e085ad6a4118…

MALICIOUS

PDF

53.6 KB Created: 2020-08-30 16:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bca876bca5d94ebe3deceac60dd1d15 SHA-1: 69cff657a29fadc90b6f13fac5cf5acad043d521 SHA-256: 9725e085ad6a41181b579c298e8070948b547c5dd6fd1bf35915a605c698ce59
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Jothidam books in tamil pdf' and a URL that matches the redirector. The presence of many external links, including to Shopify domains, suggests an attempt to leverage SEO or distribute content through a link farm, potentially for malicious purposes. No scripts were extracted from this sample.

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.link/wix?keyword=jothidam+books+in+tamil+pdf
    • https://static.usrfiles.com/ugd/74a852_fd55b49f0f464868b421acc02d36864b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d17f86de185d4dbb85c88ce5c9e47c2f.pdf
    • https://static.usrfiles.com/ugd/2813e2_f9493f62f8b944789958854b17d487af.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_74e1a6d2c0864214b655b7cdb8c31777.pdf
    • https://static.usrfiles.com/ugd/ace02d_fd42748fa0c547a1ba1ecdb2e2c1de5c.pdf
    • https://cdn.shopify.com/s/files/1/0439/9074/5246/files/ruvazetatobupozugosedinad.pdf
    • https://cdn.shopify.com/s/files/1/0439/1721/3851/files/conditional_sentences_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0464/8216/1832/files/neduve.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/samuduf.pdf
    • https://cdn.shopify.com/s/files/1/0430/1612/6625/files/59192186924.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/musixesasugiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/9621/0594/files/4311183404.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/linux_vi_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/wovirogewolajajoga.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
stream_004_off0000775f.bin
1af5858638ef00a37b6d4b1ec61a0e07cbdebaf53b1bc51ef4366a5c104d33a2
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x775F 12316 bytes
font_00_sfnt_off00006530.bin
d7ae3e24db97dc31ad13cd6e6599441afd6454fabd622569b3ee77ce63776b07
pdf-font-stream PDF embedded font (sfnt) at offset 0x6530 5380 bytes
font_02_sfnt_off0000974f.bin
ddd209e255102c799983fe574a6f4b7d1e3dd9f50817ce250fa71106262b6719
pdf-font-stream PDF embedded font (sfnt) at offset 0x974F 15596 bytes