Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ada37cc4491d9d4…

MALICIOUS

PDF

35.1 KB Created: 2020-08-01 12:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d32d0abbb4e1ddfe921f7d77370fc63d SHA-1: 89015fd9dbbf05f8ba9898f73c86ce5462a8ba7f SHA-256: 1ada37cc4491d9d46b773197de547878824302e49cccf547dacfe404471894c8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The document body, though heavily obfuscated, contains references to academic finance texts and the malicious redirector URL, suggesting a lure to trick users into downloading potentially harmful content. The ML classifier 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/pify?keyword=essentials+of+corporate+finance+7th+edition+pdf
    • http://files.bandyphotos.com/uploads/1/3/2/6/132681352/wovebe-maletiwapowoba-temegim.pdf
    • http://files.risingravenband.com/uploads/1/3/1/3/131384018/buvab.pdf
    • http://files.solomonrecovery.com/uploads/1/3/0/9/130969514/saziradefotene_bovogaf_nanewajol_sodapobobis.pdf
    • http://files.tucanursing.org/uploads/1/3/0/9/130969377/6326045.pdf
    • http://files.eztaughtme.com/uploads/1/3/0/7/130776031/zesubiwe_fazif.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/98071696694.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/95281900575.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/savinurodabarizedunim.pdf
    • https://cdn.shopify.com/s/files/1/0438/7300/9819/files/98586742126.pdf
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/padusobubev.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/xexudunivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8304/6813/files/zobavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/sinosoruraredugujad.pdf
    • https://cdn.shopify.com/s/files/1/0438/7300/9819/files/36482062712.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/98396008029.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/wafuluporaxomokidefemipak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5765/1613/files/wusunabanavo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9830/files/54825060481.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49221060197.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_off00004c61.bin
db74f41702eac1f4ac5bd59996f3f3754383c0d38d86acb019874bbdc74adcb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C61 5280 bytes
font_01_sfnt_off00005e59.bin
33f8e4095137176af9416137ff4eb48cace86e329e37a0cb13d7992a8ce311a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E59 9520 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.