Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0f4fc923371130…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 18:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f819662d4fa66691eb71e0ff96f2f32 SHA-1: c61c9dbb7d9af55fd6b5f7ce701375c6a7f4847b SHA-256: df0f4fc923371130810f958b65fd8f69621ddf552b0947f3242397f1f5107f6b
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is ttraff.ru, which is known for redirecting to malicious content. While no scripts were extracted, the sheer volume of embedded links points towards an attempt to lure users to external, potentially harmful, sites. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=abdurrahman+%25C3%25B6n%25C3%25BCl+nerdesin+indir
    • https://cdn.shopify.com/s/files/1/0432/5549/6866/files/sasalakeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0823/files/ximifipitosalupigefune.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7345/files/tesis_tipo_descriptivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5637/files/dietrich_bonhoeffer_biography.pdf
    • https://cdn.shopify.com/s/files/1/0429/3020/8924/files/bamamuduzokaromumedamiv.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fc549d0f0334faeb1aebdd45eb418b5.pdf
    • https://static.usrfiles.com/ugd/9e41f0_1e2900eb5494405fbc087a3b5430ea80.pdf
    • https://static.usrfiles.com/ugd/93971e_2d690df5d1214235b43c6f804cace92f.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/balancing_chemical_equations_8th_gra.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2460/files/bronchial_asthma_article.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/poe_vaal_breach.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3155/files/a_wrinkle_in_time_quiz_chapter_1_4.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/bsc_2nd_year_zoology_practical.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/nuvotavi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0120/7193/files/amelia_bedelia_4_mayor.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/madabe.pdf
    • https://cdn.shopify.com/s/files/1/0441/0041/9736/files/34194376913.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000462b.bin
1eb069c0271e903fca4a3de67a69eb05e69b7359fe54f93b28e696826a792c53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x462B 5144 bytes
font_01_sfnt_off00005729.bin
e2f032e0618200c122031006e5da7d6cd22919e64ed3879c6712116630057f09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5729 15132 bytes
font_02_sfnt_off000084a6.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A6 4324 bytes

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