Malicious PDF — malware analysis report

Static analysis result for SHA-256 8560183074f16916…

MALICIOUS

PDF

51.6 KB Created: 2020-07-31 04:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad3e27967dc7a1a35ce260d23ee5433c SHA-1: 83635ef4e48c90814443cee22c29033f9976050b SHA-256: 8560183074f16916e5c75b46406c793fa8426e3975fc895c23a440872bb1e041
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=c+language+notes+pdf+free+download', is flagged as a known malicious redirector. The document's content is designed to appear as a free download for C language notes, likely to entice users to click the malicious links. No scripts were extracted, but the presence of malicious redirectors and the link farm strategy indicate a high likelihood of leading users to malicious content.

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=c+language+notes+pdf+free+download
    • http://files.laurenandersonrealty.com/uploads/1/3/2/7/132710676/fb2e28b83cf29d3.pdf
    • http://files.rachelheltonmusic.com/uploads/1/3/2/6/132681033/424764e2.pdf
    • http://files.berkshiremilitarymuseum.org/uploads/1/3/1/4/131483603/5e6aa1c9f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kujefitil.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4329/files/6646018711.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/rinod.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8213/files/nupuvematopizojudisaban.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/fapewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/zujobofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/35483123187.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/49960852183.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9823/5289/files/debuv.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000744c.bin
ad846b64f9422e1f3fab7c2d5ee9e12732ae8add0fac85ab7f94947cc0d1fbd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744C 5156 bytes
font_01_sfnt_off000085fd.bin
06f6af9b890f2250f8f475dbe3bb466b9832926e06c49e5b1d4fcd2b33a8bb16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FD 10572 bytes
font_02_sfnt_off0000aa23.bin
71a1f245e3b7b4b66cb56281ad327e0c7386c8a20ee3cdc49871311ce29d0c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA23 16828 bytes

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