Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23377c813d7f04e…

MALICIOUS

PDF

51.1 KB Created: 2020-08-08 08:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 202cc32961af3c5a2bc8ab4e66c518b3 SHA-1: 2f095f3c2715f7f29dff6b779ea338a566907442 SHA-256: f23377c813d7f04e97bcfa2123d20f0177c3acb6731dbd5ae7d93d6e1cb9bc8a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on various domains, many of which are benign. The primary malicious intent appears to be redirecting the user to the 'ttraff.cc' URL, likely to serve further malicious content or phishing pages. The ML classifier also 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.cc/pify?keyword=php+7+data+structures+and+algorithms+pdf+download
    • http://files.nathanhwhittaker.com/uploads/1/3/0/9/130969474/8043f.pdf
    • http://files.springvillebaseball.com/uploads/1/3/1/4/131406507/6928486.pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • https://cdn.shopify.com/s/files/1/0432/5913/4112/files/business_law_book_by_sushma_arora.pdf
    • https://cdn.shopify.com/s/files/1/0431/4012/0733/files/wowifirav.pdf
    • https://cdn.shopify.com/s/files/1/0438/9237/5704/files/19708266541.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/debijogevesurumukuzorokef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8487/files/68637926835.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1752/files/tuxazido.pdf
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/primary_auxiliary_verbs_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/valvular_heart_disease_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/95394580584.pdf
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/60517021129.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/17591156169.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2567/files/11928663505.pdf
    • https://cdn.shopify.com/s/files/1/0433/8106/3838/files/objective_agribusiness_management.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/xigepogulel.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000649f.bin
287cf7b1b9c01e489c7c623725d97fd90ebd2f9d753c99436d5f393ceb51c77b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 5624 bytes
font_01_sfnt_off000077a5.bin
7b5e9645920b175e35e49993158718d8e6974485e0b455ff0118dde06ca0f6e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A5 10080 bytes
font_02_sfnt_off00009a52.bin
49230a07578f2a0b108554ff1d47b1cb24b8f8081254bad551c0ce72ea05e0a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A52 16544 bytes
font_03_sfnt_off0000b095.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB095 4324 bytes

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