Malicious PDF — malware analysis report

Static analysis result for SHA-256 88aa4ec23e856fbb…

MALICIOUS

PDF

47.7 KB Created: 2020-08-24 10:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0770de4251b01ed449c9792cd45be6a0 SHA-1: ceec7539d73fedf870710d364e11b253d2ad8637 SHA-256: 88aa4ec23e856fbb417c79ab6ad0248a045a0987febc68f1ee1b31b34933f832
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body contains the URL for this redirector, indicating an attempt to lure users into clicking it under the guise of downloading a song video. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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=assamese+new+bihu+song+video
    • http://files.queensdanceproject.com/uploads/1/3/1/3/131383727/a0ace02.pdf
    • http://files.movingmemorycompany.com/uploads/1/3/0/7/130738673/259850.pdf
    • http://files.mrshilario.com/uploads/1/3/0/7/130776619/4548108.pdf
    • http://dapefa.utahstudentnurse.org/uploads/1/3/1/4/131438304/vezoziwofu-nobizobenofusu.pdf
    • http://files.harleyerdman.com/uploads/1/3/1/1/131163578/kiwadikaxelobaselel.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7472/files/physics_class_11_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0428/8181/0599/files/anastasia_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duliwoledemovaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/61573307572.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9784/8996/files/50880005189.pdf
    • https://cdn.shopify.com/s/files/1/0428/5507/1900/files/madeline_hunter_lesson_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/1017/0786/files/anagnrisis_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/11493548224.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6140/files/pevet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/konibaroxozepi.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000540d.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x540D 6744 bytes
font_01_sfnt_off000064f4.bin
9c43e7852c45d01896efaf53c64676378747923d5203225899e90d9da9deb3b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F4 5192 bytes
font_02_sfnt_off0000766b.bin
ff6f50938146b34ab7d9aa472a0f0df7788fcca6f78c97d2a490c66771d8d684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766B 2144 bytes
font_03_sfnt_off0000802a.bin
e6a7018e963c3e0dfa52be2f5f9c7b28a064d28d8adf166fea7a550a97e347c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802A 10268 bytes
font_04_sfnt_off0000a312.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA312 4324 bytes

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