Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2c2fc77c3f288a…

MALICIOUS

PDF

57.0 KB Created: 2020-07-28 23:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 110e76c5da696e57a1a4c58600e3b0dd SHA-1: 20ecfac734347504ad7104a29fe3b9228e86806e SHA-256: 8b2c2fc77c3f288ab9162799ca32511342361e160d7a80ce980c44ff66c180eb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to movie audio songs, likely to entice users to click on the malicious links.

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=baahubali+tamil+movie+audio+songs+free
    • http://files.michellemorrisonwrites.com/uploads/1/3/0/8/130874680/kibubafokujabab_gadufobotelam.pdf
    • http://files.myrugbyposts.com/uploads/1/3/1/6/131606688/c4a0d.pdf
    • http://files.absolutezeronoho.com/uploads/1/3/2/8/132814898/jujifuzomesaso.pdf
    • http://files.bodygodzmassaj.com/uploads/1/3/1/6/131637148/nonivatinot.pdf
    • http://files.redemptivedivorce.com/uploads/1/3/0/8/130813395/lopika-zavutexafup.pdf
    • https://cdn.shopify.com/s/files/1/0432/0090/5380/files/42277889756.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/nijovesokut.pdf
    • https://cdn.shopify.com/s/files/1/0433/9181/1734/files/kaletidix.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/95328731448.pdf
    • https://cdn.shopify.com/s/files/1/0440/0994/7301/files/1237528899.pdf
    • https://cdn.shopify.com/s/files/1/0433/8129/3221/files/gaxerutirelidoti.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4044/files/12119174559.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7795/files/gapawimolopaduperazutatid.pdf
    • https://cdn.shopify.com/s/files/1/0435/9982/3016/files/75502873276.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/wavinobup.pdf
    • https://cdn.shopify.com/s/files/1/0432/0323/1903/files/fajetawigokegameguvo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0827/6126/files/12828989494.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_off00009cb9.bin
969ba5ec488f1cb69d042c36e170b5d28cb6cdd4bf8c5f7b583de05de221f952
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB9 5452 bytes
font_01_sfnt_off0000af21.bin
7aeb814c029d23998d3a82521991d3355319c9aed028b85dab5828790603a94d
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF21 12236 bytes