Malicious PDF — malware analysis report

Static analysis result for SHA-256 116d251f724d55f8…

MALICIOUS

PDF

41.1 KB Created: 2020-08-21 12:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7044c4f8db3bfd72f2f6ef5a8a08d033 SHA-1: c4b7120d92ed2d647495f04e403c1602d6547408 SHA-256: 116d251f724d55f856b2b567031522bf9490c819997e6f2dd5f92ed23abe69fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious due to a high number of external links, indicating a link farm designed to redirect users to potentially harmful content. The primary malicious URL identified is ttraff.ru, which is known for redirecting to malicious infrastructure. The document body contains obfuscated text and URLs, further supporting the malicious intent.

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=dryer+sheets+mice+car
    • http://files.sunflowerhouse.waggamatters.com/uploads/1/3/1/3/131397950/raxatagesana-girotulis.pdf
    • http://files.pacificat-shirts.com/uploads/1/3/0/9/130969332/8925150.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0552/5661/files/pobizujam.pdf
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/high_school_reading_comprehension_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/regodewasoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0849/9618/files/fajamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9167/2736/files/tatetonijuxiwubawuzig.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/begemojenovomowene.pdf
    • https://cdn.shopify.com/s/files/1/0432/4373/3154/files/cessna_340_performance_charts.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/pamabotimiwexovubikuzuni.pdf
    • https://cdn.shopify.com/s/files/1/0452/2953/9485/files/business_letter_format_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/2427/5863/files/cambridge_advanced_trainer.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/govin.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2903/files/63926303115.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064f9.bin
4ef12a368080804b4666a843e7280a0f72c5b5454f0952b1f0ee3992e838b9a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x64F9 5108 bytes
font_01_sfnt_off00007638.bin
cf42571a329b7390b7ab8ebe95f78866a6e6c5bc42cc5e839b5794abab45399d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7638 9828 bytes